Choosing The Right Locks
Entry lockset (key-in-knob) Most common on and convenient but it is not secure enough. Adding a deadbolt is necessary.
Deadbolt (When used with a key will extend a bolt that will resist opening of door when fully extended.
Single sided deadbolts should only be used on solid wood or metal-clad doors.
Double Cylinder deadbolts should be installed were glass can be broken on door But remember in case of a fire you should always keep a key in reach.