if its not actually broken, and its just the release mechanism stuck, you are in luck.
just go to the front and grab the hood and try and pull it up and down forcefully. give it a smack with the fist (but dont dent your hood). this will ussually release the hood and you can than give it a good soak in penatrating oil.
this will take 2 people ussually. one to pley with the leaver and one to be a little rough with the front of the hood.
If the cable is broken and you can pull the entire wire through the sheathing, than you will have to get some long hooks to release it.
the release is always hidden to deter theft, but it is possible. either going underneath through the rad support area or through the front.
it will not be easy but if you bring it to a shop, that is all they are going to do untill it releases.
again, without long skinny strong hooks, you will not be able to do it, but im hoping that the latch is just stuck and a few good tugs and smacks will release it