| Labman is right about the simple sliding bolt lock. If that did not fulfill your needs just use a deadbolt lock that takes a key on the bedroom side and a turning knob on the inside, that way if the people in one bedroom tries the door and it wont open they will know it is locked. And if the people in the other bedroom forgot and left it locked the other bedroom people can unlock it with a key, hopefully there is no one in the bathroom.
You can buy these at any hardware. |