Depends on if the wire broke. Theres a cable from the hood release lever, inside the car, to the latch itself. It could just be stuck. Have someone hold the lever, in the car, all the way. While someone is holding it, have someone hit the front of the hood with a hammer fist. Thats worked for me on a few cars I had.
If you pull the lever in the car and it absolutely feel no resistance to when you pull it, then the cable might be broke. Do what the other guys suggested above.