by Raymond » 1 Dec 2010 21:38
As best I can see in the photo, the hole looks round. Therefore I would suggest a square or hex shaped tool to open it. If there was any intedned security, it might be ward where the tool must have a groove cut around it or a hole in the tip. Look in with a good flashlight and go according to what you see. I do not think these are really locks but just instead convenience latches to keep kids from putting their siblings in.
Nothing is foolproof to a talented fool. Wisdom is not just in determining how to do something, but also includes determining whether it should be done at all.