2 hours thats loads of time! On holiday in Crete with a mate who at the last minute whilst waiting for the bus to the airport to come home, got caught short, the bus was ready to go and still no sign of my mate so I go to the loo and call his name, he has the bolt part of the lock in his hand and asks if I can help, using my weight a shoulder to the door and it gave way, my mate was in front of the door when it gave way, we made the bus.
May be a daft question it’s not a lock you can put a screwdriver in from the outside and turn?
Can you access the hinges from the outside and unscrew?
Talk him through how to unlock it?
Shoulder to the lock end would be my choice if not a sledge hammer to the top and bottom corners as well as at the lock.