I had this problem and tried to fix it. I wound down the window and pulled the inside panel of the door off at the top, be careful not to pull too hard. This givies you a bit of space to put a metal coat hanger down inside the door and hook onto to the brass coloured mechanism. After a couple of goes i managed to hook onto it and release the door.
However I have now got a load of other problems, lock bracket coming off, electrics failing etc.
mark
January 2010