Driver door stuck shut.

[nathankershaw]

I searched and couldn't find a specific answer to this question.

1964 GMC.
My drivers door is stuck shut. Not totally shut but where it loosely rattles.
The truck has been stood since 1993 so PB blaster has been used

The mechanism pulls the 2 hooks away from the barrel that latches to the latch on the B pillar but that barrel doesn't seem to want to spin to let the door open.

I may just be seized but I wanted to ask if anything obvious happens to stop that barrel from spinning?

Thanks for any help and sorry for these annoying little questions.