Advice need:

BMW 525i 94 the rear driver side door will not open.  It does not seem
to have any connection to the lock from the outside or inside
handles.  The lock actuator is making a noise like it is working
properly, but even when I manually put the cable to open the door
nothing happens.

I want to know how I can release the lock by working on it from inside
the door itself.  I can reach the lock with my hand but don't know
what to do.  Don't know if there is a release lever/button or
something in there to release the locking mechanism.

Any advice out there on how to release/open a seized locking mechanism
on a BMW driver side rear door.......NOTE: I have the door panel and
vapor barrier off already