We have a simple small bolt and keeper. It has a plastic body in which the metal bolt slides. A roller ball catch keeps the door shut and the bolt is easily 'kicked in ' if any of the grandkids are in bother.
No-one gets stuck in there....not even three old ladies !
www.youtube.com/watch?v=lbmYVdgqYb0
I'd have liked to see Mrs Lud shinning down the soil pipe in her nightie !
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