lol, happen also from our house helper, she was trapped for 3 hours inside my sisters room (my family wasn't home :D), when we discovered it, the knob was stuck (like it was lock) but it won't budge, we have to call a lock smith and tried to unlock it but nothing and leads to dismantling, (funny thing is the screw part was inside the room) :D but we manage to pass screw drivers through the balcony and done :D
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