If, when you reset it, it springs into place after a little help, then you can probably fix this by re aligning the door striker ( the part mounted to the body that the 2 latches grab on to). If there is no springy action whatsoever, your latch assembly might require replacement, or at least a new return spring for that latch part. If you do determine realigning the striker might fix the issue, be sure to mark the strikers current position before loosening it. I think having to realign these is common after the striker bushings fall off, leaving it sloppy and not completely engaging with both latches. If your striker bushing is still on,might want to check for damage at the hinge end of the door.