There Are More Kinds Of Locks Than Just Pin Tumblers Or Deadbolts
Most people are familiar with just a couple of kinds of door locks. Those include deadbolt locks and the basic pin tumbler locks. You probably have a pin tumbler lock in your exterior door. The lock is in the handle of the door. When the lock is turned, it generally keeps the tongue of the door's handle from moving from it's hole in the door frame. You probably also have a deadbolt.