How do you fix the door latch on a 1997 Buick Riviera?

To fix the door latch on a 1997 Buick Riviera, first, remove the interior door panel by unscrewing any visible screws and carefully prying it off. Inspect the latch mechanism for any debris or broken parts, and lubricate it with a silicone spray if it appears stiff. If the latch is damaged, replace it with a new one by detaching the old latch and installing the new one in reverse order. Reassemble the door panel and ensure everything functions correctly before closing the door.