The only way i can think of would be to remove your bumper so you can get to the latch, and either unbolt the latch from the core support or unbolt it from the hood...
The latch is broken or out of adjustment.
If the trunk on a Honda Civic will not close the locking mechanism may be jammed. Be sure to remove any obstructions on inside the trunk latch. If the latch is broken replace it.
The reason is because the cable connecting to the latch has already been over stretched. Changing a new cable should rectify your problem.
The latch itself is held on with bolts, easy enough to change. The release cable has to be fed down the inside of the rocker panel and into the trunk.
if your'e lucky get under the car and reach up between the fan shroud and the motor, feel around for the latch and where the cable attaches to the latch, grab the cable with pliers and pull away from the latch if the space is too small the only other way i know of involves damaging your grill best of luck with this one =o)
go through the grill and use a heavy duty screwdriver to pry back the latch
crawl under the car and see if you can see the hood latch and cable grab the cable give it a good YANK to the right it may take a few tries but it has worked for me before, hope it works for you.
dodge truck broken hood latch
With a pair of pliers pulling the latch.
The latch is broken, not the cable. You can still get to the cable where it is attached to the latch in the foot-well of the car. Grab the cable with a small vice-grip (or similar) and pull. Note that it is very unlikely the cable will break -the latch typically breaks before the cable since the latch is made from plastic and the cable from steel wire.
Listen carefully, go get a sledgehammer and then slam the hood with it as hard as possible.
If you mean the cable that goes to your latch and its snapped or something easiest way to do it is basicly grab a hold of the cable and pull on it and of latch would.