Gmc Sierra Door Lock Stuck

I was able to open the passenger side and found the lower latch mechanism was froze.
Gmc sierra door lock stuck. The lock on my door still goes up and down as if it can be locked and unlocked. Both rear doors on my 2004 gmc sierra 1500 would stick or would not open. I have also tried using my key in the keyhole on the outside but still nothing. Still working on the drivers side lots of rust as the vehicle has over 300 000 miles.
Enjoy the videos and music you love upload original content and share it all with friends family and the world on youtube. Https www paypal me bensahlstrom your support really means a lot and helps me keep making these videos. However when it is in the unlocked position i still cannot open my drivers door from the inside or the outside. Get a flat blade screw driver here and you wont get greasy https amzn to 2zsjebm this confused me as a kid 10 or so years old when the truck was bought i.
I have tried to push it up but it is firmly set in place. Send a small tip of 1 or more. Any idea o read more. The lock system still works from my drivers door as well as my key fob.