Mmm... Difficult to open door, but have you switched if off at the wall? If not, try that and leave it for a little while, if that doesn't work, Squease the door release and sharply push and pull the door (don't go mad though!) If that still doesn't work, MAKE SURE ITS OFF AND UNPLUGGED then take the top off, put your hand down to where the door interlock is and push it open from there. The chances are that you need a new interlock, and these are not that expensive.
Kevin
August 2006