Door latch does not latch

If you close it and it just does not latch the most likely cause is a failure inside the latch. There is a spring inside that pushes a pawl in place that catches on the back of the rotating part of the latch. That spring either fails and the rotating part of the latch does not latch, or dirt and rust build up on the sides of the locking pawl and it cannot move. The best repair is a new latch. It involves taking off the door panel, removing the vapor barrier, removing the outer door handle, and then replacing the latch. Below you can see images of the latch and its location.

Oh if you go looking for parts GM calls the entire unit the door lock actuator.

There is no real service procedure for this type of fault. The fact that you have the panel off is a good step ahead. Trace the linkage rod from the inside door handle to the latch, and see what it actuates, and can it be manually actuated. Also do the same for the lock rod, has any of them come disengaged. If you can determine how it operates, you may be able to come up with a solution to get it open. If you unbolted the hinges, you would still have the door latch attached. Getting the door correctly adjusted after loosening the hinges, would almost take a body shop. Is the door still closed tight, or has it become slightly ajar? If it is slightly ajar, and everything appears to be attached, push on it to try and close it fully and try the cycle again.

It could be the latch inside the door. Or the striker. With the door open try locking and unlocking the door either by key, button or the remote, while watching the door latch in the door jamb for movement. Let us know what happens.

Your welcome, is the striker bent.( The part the the latch hooks onto)

Your local Chevy dealer will be able to help
also you can check your local used auto part supplier

Check the inside of the remote where the battery goes, the tab that holds the battery sometimes breaks, if the remote is fine replace the remote control door lock reciever and antenna, very common on these vehicles.

I suggest first having charging system tested to ensure battery and alternator are in good condition. If OK here, inspect wiring of power door locks. If the wiring is damaged anywhere it will cause the circuit to short out which allows the locks to work on there own at undetermined intervals and times.

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I would start off by disconnecting the lock switch on the driver's side and see if the problem goes away. The try the passenger side of the driver's one doesn't fix.