Same thing happened to me not so long ago. The handle didn't snap off, but the spring went and rendered it completely useless. After about 20 minutes of sliding a thin flat screwdriver down the gap, exactly where the lock is, you can feel the lever that just needs to be clicked. I think it takes a bit of luck, as you can't see anything at all. Just try and get a feel for it, and it will open as soon as you connect well. I was very relieved, as all it ended up costing me was the replacement handle (all of about 7 quid), even managed to avoid marking it, but wouldn't want to have to do it again! Good luck!!