Yeah, I'm ruling out it being the door frozen. If it was, (a) the lock pin would probably go up and down as the electric switch worked the mechanism, and (b) I wouldn't be able to flip the catch into the closed position with a pen, and with the door handles closed, be able to flick it open.

That, and the fact that it has been doing really stupid stuff like stalling as soon as it is put into gear when it has been idling means it was time for a trip to the doctor.

As for why I walked- I wasn't thinking clearly. I was annoyed, and feeling stubborn after putting up with really stupid people all day.