Repair Log: 2001 QX4 Door Stuck Shut

So, we called the local Nissan dealer to ask about this. The guy said that
they had a Pathfinder do the same thing once. Here is the fix he suggested
and that we used:

The latch mechanism is the problem. This is the thing made of mostly white
plastic that is held into the door by three torx screws.

We carefully separated the window weatherstrip, inserted a long and beefy
flathead screwdriver, setting the end on this piece of plastic. Three
whacks with a hammer and it started to break into pieces.

We then had to fool around with the rods and such to get the door to
unlatch.

Once the door was opened, it was a simple matter of replacing the part. We
were able to save and reuse the actual electric actuator that makes power
door locks what they are. That saved us $70 but it sometimes breaks to
pieces with the rest of the assembly.

Total cost of repair was about $100 and an hour of time. I am sure a dealer
would have charged 300 - 500 for the fix.

Thanks to all who responded to my original post.