It might be a surprising topic but we get a lot of phone calls every week from people whose bathroom or bedroom door got looked. The solution, although very simple, is not known to a lot of people. Watch this video where Terry Whin-Yates explains what to do.
Most privacy lock have a hole in the knob on the outside, the lock can be unlocked by simply using any tool that is small enough to be pushed into the whole. You may use a small screw driver or even the inside part of a pen.
We recommend to , keep such a tool handy. In case it is locked by a young child with you on the outside and the child on the inside. It could save you from considerable anxiety and frustration trying to get a child to unlock the door.