If the front hood latch handle moves, but won't release the lid, it may be that the cable is broken. There's a backup cable in the system. Kneal down on the ground and look at the release handle. There will be a cable curled up with a long metal end piece snapped into a clip. Remove it from the clip and pull it with a pair of pliers. If the latch is working, this will release it.
For the engine deck lid, you can't get into the trunk any way but with the key or a remote release. Breaking into the grills will only break the grills and give you access to the battery or air filter. If you can't get the key to work, then it's best to call a locksmith. I'm guessing that you don't have a remote trunk release on the upper right side of the instrument pod? If you do, and you just have a dead battery, let me know and I can get you into the engine compartment.
Edit: for what they said about the release cable. I have a device that plugs into the cigarette lighter and powers up the car. Also, you can use a 9V battery on the trunk release switch and get it to release.
Edit again: Here's a how-to with pics on jumping the release switch.
http://www.fiero.nl/forum/Forum2/HTML/085536.html