help!

[goldilocks]

i'm in the flat - but can't get any further than the hall / bedroom

our internal door which leads to the living room and bedroom has had a faulty lock since we moved in, but it has now finally given up the ghost
it won't even consider opening
maintenance aren't answering the phone, the letting agent has said that if we screw the door handle off we're causing willful damage to the property and will lose our deposit (£800)
BUT
the rabbits are in the living room - i can't get to them, i can't even see/hear them and i'm going out of my mind!

what could / should i do?

*cries*