Geeze! We have those same locks and I finally figured out how to get them open. Our house came with the thing to pic the lock and it's deceiving b/c the tool is much longer then how much you put it in (and it will go all the way in - it just won't do you any good). So one day I sat down and figured it out and used a piece of tape and a marker to mark the spot on the tool so I'd know exactly how far to put it in. It's really very tricky, even with that! I'm so sorry for your son! That must have been scary for him! I keep waiting for my younger dd to do that in the bathroom cuz she's always trying to lock the door. Glad everyone is okay!
Mama to four remarkable kiddos, all born at home.