Privacy Door Knobs Handles Privacy door knobs handles are a kind of interior lockset. The main feature is it includes a twist, push pin, or turn button to open or lock the door from one side(inside or outside), but the other side no key device on the outside knob to open the door. It is often used in bathrooms and toilets. In an emergency, privacy lock door knobs handles can be unlocked from the outside with a small pin or emergency key. Privacy door knobs can be applied to the bedroom, bathrooms, and any other rooms that ask for a little privacy.