St Johns Locksmith Service Team
Local locksmith team
Jul 4, 2026 11 min read
Most homeowners in Highland Park give their front door a quick glance and assume the hardware there is doing its job. But there is a significant difference between a door knob lock that spins smoothly and one that actually resists a forced entry attempt — and understanding that difference could be the most practical home security decision you make this year. Whether you live off Park Avenue West near Rosewood Beach or in a quieter residential pocket closer to the Ravinia neighborhood, your exterior door hardware is the first and most visible line of defense against intrusion.
This guide breaks down exactly how a standard door knob with lock compares to a deadbolt, what each one can and cannot do, and how to prioritize your upgrades without overcomplicating the process. We will also cover mortise lock options for homeowners who want the most secure configuration available — a setup our team at St Johns Locksmith installs and services throughout the Highland Park area every day.
## How a Door Knob Lock Actually Works — and Where It Falls Short
A standard door knob lock, sometimes called a knob lock, uses a spring-loaded latch bolt that retracts automatically when the knob is turned. That spring mechanism is what makes it convenient — you do not need to think about it — but it is also exactly what makes it the weaker of the two common lock types. The latch bolt in a typical knob lock is beveled, meaning it compresses on contact with the door frame strike plate and pops back out once the door is fully closed. A determined intruder can often defeat this mechanism using nothing more than a credit card or a firm shoulder, because the latch is not truly locked into the frame — it is only resting there under spring tension.
A door knob with lock and key does add a keyed cylinder, which prevents casual turning of the knob from outside, but that cylinder is housed directly inside the knob itself. This placement makes the knob vulnerable to a simple gripping attack — the knob can be snapped, twisted, or struck in a way that exposes or disables the cylinder entirely. This is why security professionals are consistent on one point: a knob lock alone is not adequate for any exterior door that faces a real threat. Use them on interior doors, like a door knob with lock for bedroom privacy or bathroom security, where they work perfectly well. On your front door, back door, or garage entry, a knob lock should always be paired with something stronger.
## Deadbolts: The Standard Your Exterior Door Knob Lock Needs Beside It
A deadbolt works on a fundamentally different principle. Instead of a spring-loaded latch, it uses a solid metal bolt that moves horizontally into the door frame only when you physically turn the key or thumb turn — there is no spring to compress or bypass. A properly installed single-cylinder deadbolt extends at least one inch into the door frame, and when that frame is reinforced with a heavy-gauge strike plate secured by 3-inch screws that reach the wall stud, the door becomes dramatically more resistant to kick-in attacks. This is the combination that building security guides and insurance underwriters consistently recommend for residential exterior doors.
The most common deadbolt failure points have nothing to do with the lock mechanism itself — they are installation issues. A deadbolt installed in a hollow-core door, a door with a weak frame, or one using the original short screws on the strike plate gives up most of its advantage. If you are unsure whether your deadbolt installation meets a reasonable security standard, our team can assess the full door system — frame, strike plate, bolt throw, and cylinder grade — and let you know exactly what, if anything, needs attention. Call (847) 462-4140 and we can schedule a visit or help you over the phone with a quick assessment.
## The Mortise Lock: When You Want the Most Secure Configuration Available
If you want to go beyond the standard deadbolt-plus-knob-lock setup, a mortise lock is the configuration worth knowing about. A mortise lock is a single integrated unit that fits into a rectangular pocket (the mortise) cut into the edge of the door. It combines a latch bolt, a deadbolt, and often additional security pins into one housing, which means the entire locking mechanism is embedded deep within the door rather than attached to its surface. This design eliminates many of the attack surfaces that exist on surface-mounted hardware — there is no exposed knob cylinder to snap, and the lock body itself is protected by the door material around it.
Mortise locks are common on commercial doors and older Highland Park homes built in the early to mid-twentieth century, many of which already have the door prep for a mortise unit. They are also increasingly popular for homeowners upgrading exterior doors who want one piece of hardware that handles multiple functions securely. Our team specializes in mortise lock installation, repair, and rekeying — including sourcing and fitting quality hardware from manufacturers like Schlage when a replacement unit is needed. If your current door knob lock setup feels inadequate and you want to explore the mortise lock option, we can walk you through what that upgrade looks like for your specific door.
## What Burglars Actually Do — and Why This Matters for Your Upgrade Priority
A question that comes up frequently when homeowners research door security is how to pick a door knob lock or how to pick a lock door knob — usually because they have locked themselves out and are curious whether they could get back in themselves. The honest answer is that lock picking, while a real skill used by trained locksmiths during legitimate lockout situations with verified ownership, is not something we recommend homeowners attempt. Picking a lock incorrectly can damage the cylinder, make the situation worse, and in some cases void any warranty on the hardware. If you are locked out, the right move is to check for a spare key, see if another entry point is accessible, or call a professional locksmith — not to attempt a bypass on your own.
What matters more for security planning is understanding how most unauthorized entries actually happen. The overwhelming majority of residential break-ins involve brute force — a kick to the door, a shoulder hit, or a strike against the knob — rather than any kind of technical picking technique. This is why a quality deadbolt with proper strike plate installation stops most real-world threats, and why upgrading the frame and hardware matters more than worrying about picking resistance on a standard knob lock. If your exterior door currently relies only on a spring-latch knob lock, that is your highest-priority upgrade, regardless of anything else on your security checklist.
## Making the Right Choice for Your Home — and When to Call a Professional
Here is a practical framework for prioritizing your door hardware. Start with exterior doors: every exterior entry point should have at minimum a grade 2 or better deadbolt installed correctly, with a reinforced strike plate. The existing door knob lock can stay for latch convenience, but it should not be the primary security mechanism. Interior doors — bedrooms, home offices, bathrooms — are fine with a standard door knob with lock for bedroom privacy; there is no need to deadbolt every interior door in your home. If you have an older home with original mortise lock hardware, do not remove it in favor of a simple knob lock — have a locksmith assess and restore that hardware instead, because a well-maintained mortise lock is significantly stronger than most surface-mounted alternatives.
For Highland Park homeowners managing rental properties, running a home business, or dealing with doors that see heavy daily use, a commercial-grade mortise lock is often the right answer for durability as well as security. Our team provides commercial locksmith services in addition to residential work, so whether you need hardware for a single front door or a multi-entry property, we have the experience to recommend the right configuration. Factors that determine the final price of any installation or repair include the type and grade of hardware selected, the condition of the existing door and frame, any parts that need sourcing, and the time of day the service is needed — we confirm an exact up-front price before any work begins. To talk through your specific situation, call St Johns Locksmith at (847) 462-4140. We are available 24 hours a day, seven days a week, including for emergency locksmith situations when you need help right now.
## St Johns Locksmith Highland Park — Services We Provide
Our mobile locksmith team serves Highland Park, IL 60035 and the surrounding North Shore communities. Here is a full picture of what we handle: residential deadbolt installation and upgrade, mortise lock installation and repair, door knob lock replacement and rekeying, smart lock installation and programming, high-security cylinder upgrades (including Schlage B-series and similar), strike plate reinforcement and door frame repair, master key system design and installation, lock rekeying after a move or lost key, emergency residential lockout service, commercial locksmith door hardware installation, commercial mortise lock service and repair, panic bar and exit device installation, access control system installation, keypad and electronic lock installation, mailbox lock replacement, padlock installation and removal, safe opening and combination change, cabinet and file cabinet lock service, automotive lockout service, car key cutting and duplication, transponder key programming, key fob replacement and programming, broken key extraction from locks and ignitions, ignition lock cylinder repair and replacement, and 24-hour emergency locksmith response throughout the Highland Park area. Whether you need a simple lock door knob swap or a full commercial access control build-out, our team handles it as a single point of contact.
Frequently asked questions
Is a door knob with lock and key enough to secure my front door?+
On its own, no. A door knob with lock and key provides a keyed cylinder that prevents casual entry, but the spring-latch mechanism and the exposed knob housing are both vulnerable to bypass and physical attack. For any exterior door, you should pair the knob lock with a properly installed deadbolt — and ideally a reinforced strike plate secured with long screws reaching into the wall stud. If you want a single integrated solution, a mortise lock installation is worth considering, as it combines multiple locking functions into one embedded unit that eliminates many of the attack surfaces found on surface-mounted hardware.
Where can I find a good locksmith in Highland Park, IL?+
A good place to start is a locksmith who operates locally, responds quickly, and confirms pricing before any work begins. St Johns Locksmith is a mobile, 24/7 locksmith team based in the Highland Park area — we come to you rather than operating from a fixed shop, which means faster response whether you are in the Ravinia neighborhood, near downtown Highland Park, or anywhere else in the 60035 zip code. Our team is experienced, insured, and trained on a full range of residential, commercial, and automotive lock hardware. You can reach us directly at (847) 462-4140 any time of day or night.
What is the difference between a mortise lock and a standard deadbolt?+
A standard deadbolt is surface-mounted — the lock body sits on the face of the door and the bolt extends into the frame. A mortise lock is recessed into a pocket cut into the door edge itself, which means the entire mechanism is embedded within the door rather than attached to its surface. Mortise locks typically combine a latch bolt and deadbolt into one unit and offer a larger, more robust lock body with more complex internal components. They are harder to attack physically because there is less hardware exposed on the door face, and they are the preferred choice for high-traffic or high-security applications. Our team installs and services mortise locks on both residential and commercial doors throughout Highland Park.
What factors determine how much a locksmith service costs?+
The final price for any locksmith service depends on several factors: the type of service needed (a simple rekey costs differently than a full mortise lock installation), the grade and brand of hardware required, the condition of the existing door or vehicle, the time of day the service is requested, and the travel distance to your location. There is no single flat rate that applies to every situation, which is why we always confirm an exact up-front price before any work begins — so you know what to expect with no surprises. To get a specific quote for your situation, call us at (847) 462-4140 and describe what you need.