I am pretty shure it's the latch, I tried moving it with my fingers and it wouldn't lock, the window was the first thing I thought about, but lowering it didn't help. I haven't dared opening the door since, so it might just have been a temporary problem, but since there are a few design/production flaws with the Mini I figured this might be one of them.
Bor i Trondheim, men takk for tilbudet.