This is the door latch; look at the top middle of the picture and you will see a black allen head screw. Loosen this screw and you can adjust the latch position that engages the striker. Mine was hanging up on the striker causing the door to stick closed. I had to pull up on the door and pull or smack it from the inside to get it to open. I adjusted this arm and now my door opens and closes like butter. Don't forget to tighten the screw down after adjusting. I have four pictures here, scroll down to see all.
This is how you reach it while it is on the car; there is a hole in the door that your wrench can fit into:
Here is what it looks like on the inside: