Rusty
The safety catch needs to be pushed upward, not down. The first picture showed that, and maybe can be accessed between the lock pillar and the door. I think it would be tough to do from inside the door shell.
The square hole in the pics is where the outside handle stem goes. But even if that won't move, pushing the safety catch upward would release the latch.
The lock (to the left of the arrow in pic #2) will prevent the safety catch from moving upward. So you need to be sure the lock is released, by moving the tab connected to the bar from the release. I believe on your truck the inside handle points down and pushes forward to the unlock position.
