MUCK Door Locks

On the outside of the locked door, create your exit and make note of the DBREF.
For the purpose of this example, we will assume that dbref is #123

Then, go inside the room with the lock, and type:

@open lock door;unlock door=#331
lock door #link #123
@lock #123=#331

Replace #123 with the real DBREF.  #331 stays as is, that is the dbref of the prograa.