Has anyone come across this problem?

My pessenger side rear door is refusing to open. When I turn the key in the
front doors the motors can be heard moving in the rear but alas the door
remains permenantly shut. Bit embaressing for friends to have to climb over
from the other door. It seems to be impossible to even open the door from
inside too. I can't even get it open to strip the door panel door to get at
the locks, etc.

Can anyone point me in the right direction? I'd be very grateful.