Close the hood and make it latch

All of the previous answers are possible. WD-40 the latch assembly, and make sure that the latch returns with spring tension. I have frequently seen twigs and other debris packed in the lock by birds. The cables can also be frozen or as the other Expert said, the mounts could have slipped and the cable is not pulling the release far enough.

LOOK AT THE LATCH AND SEE IF IT TRIPPED TO THE CLOSED POSITION.IF IT IS IN LOCKED POSITION HAVE SOME ONE PULL THE RELEASE WILL YOU USE SOMETHING LIKE A PHILLIPS SCREW DRIVER TO POP IT TO THE UNLOCKED POSITION

Or your latch is bent. their is a primary latch and a secondary latch. the primary is what hold the hood closed tight. secondary is when you pop the hood but it still holds it until you pull the release. if the hood wont latch at all, most likely it is off center or bent. if bolts come loose from the latch that hold it to the crossmember bar, it could allow it to move and wont line up so the hood to close. Also there are adjustments on the hood hinges that could be wore out allowing the hood to move forward as you close it and it is not allowing it to latch. hope this helps

See if you can tighten the cable.