Rear hatch does not lock on 2005 chevy equinox

This is a rotating latch assembly.
Assuming there is no physical door damage that keeps this latch from rotating freely;

• Ensure that little fingers haven't pre-rotated the mechanism so that it presents the wrong surface when the door is closed. Operating the electric door unlock feature should return the latch to the correct open position
• -It may be corroded. spray some WD-40 into the mechanism in the door and rotate it, release it with the electric release switch before trying to work it back open if necessary. If this is the issue, finish with some graphite lubricant spray once it is free again
• if the latch does not electrically lock, the choices for your mechanic are, the fuse, the wiring, the body and component connectors including one above the rear end differential which, is exposed to some nasty wet and muddy environments and the actual lock / unlock solenoid at the door latch.