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The level of security a lockset offers depends on its construction. Any type with only a key in the knob or handle is only marginally secure; a burglar can easily foil it. For more security, a deadbolt should be installed with at least a one-inch throw-which means it should extend a minimum of one inch beyond the door's edge and be made of case-hardened steel.
The key to getting the most out of your visit from a locksmith is understanding the different types of locks that you need to install or repair ahead of time.
Cylinder Locks
 Have a rounded body designed to fit into intersecting holes bored into the door. The deadbolt bar, which slides into a corresponding opening in the doorjamb, is the main source of your security.
Mortise Locks
 One that requires a pocket—the mortise—to be cut into the door or piece of furniture into which the lock is to be fitted. They have recently become more common in commercial and upmarket residential construction in the United States.
Deadbolt Locks
 A deadbolt is a locking mechanism that cannot be moved to the open position except by rotating the lock cylinder. A deadbolt can make a door more resistant to entry without the correct key.
Pad Locks
 A familiar sight on gates, lock doors and even luggage zippers, is a portable key-operated lock built around a steel loop that clicks into the lock's body.
Magnet Locks
 Locking mechanism whereby the key utilizes magnets as part of the locking and unlocking mechanism. A magnetic key would use from one to many small magnets oriented so that the North / South Poles would equate to a combination to push or pull the lock's internal tumblers thus releasing the lock.
Door Closer
 A door closer is a mechanical device that closes a door, in general after someone opens it, or after it was automatically opened.
Electronic Locks
A locking device which operates by means of electric current. Electric locks are sometimes stand-alone with an electronic control assembly mounted directly to the lock.
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