One type that you may need to use ... turned the same and function normally, unlike dummy door knobs, they can't be locked ...

If the door knob on your front door locks, do you really need the extra expense of a deadbolt? Our panel of experts weighs in ...

My general advice is to err on the side of ... at least one copy of the previous key on hand to reset the lock.) For a more modern look, you can forego a traditional knob for a door lever.