Replace the door latch.
To fix the 300m latch, you will need to remove the inner door panel. After the door panel has been removed, then you can check the door latch components to determine what has broken and how to best repair it.
i dont know how to fix it so you tell me how to fix it
you just have to push up on the latch
If the door latch on a 1999 Chevrolet Blazer is broken on the car frame, a new latch might have to be welded in. The old door latch will have to be cut out with a torch. If the latch is broken on the door, a new door might be cheaper than welding in a new latch.
Remove door panel and replace latch mechanism
get a hinge replacement kit for that door. its the door sagging NT the latch.
lift door handle, using screwdriver, move latch forward....will open
Get a new door, or retainer latch.
1A Auto
To fix a trunk latch that is stuck open, the teeth on the lock may have to be adjusted so the trunk will close. It is also possible that the cable for the trunk latch is broken. To fix the gas cap door latch may require a little bending and adjusting with a pair of pliers.
If you are referring to the plastic latch, its not terrribly difficult but does present some challenges. find a replacement handle, they are side specific (right and left). The door panel needs to come off to allow access to the handle. there is a plastic clip that fits over the metal rod that goes to the latch that attaches to the pivot point on the latch. Would take a mechanic about a half hour to an hour to replace if you have the part. Biggest problem was getting the door panel to reattach properly.