I have a 2007 crystler pacifica got out manualy locked the doors then came back unlockes the doors alarm went off usually ill start ut and it will go off. Well i did that and now its saying invalid key amd fob and will not start. I unhooked the batter and it still says it.

Sounds like the anti-theft feature causing issues. Is the key the original or a duplicate? If not original, do you have the original?

If you have the original and need to program another key:
1. Insert first programmed key into the ignition and turn ignition switch to ON. Wait for approximately 3 seconds then turnignition to OFF and remove key.
2. Within 15 seconds of removing first key insert second programmed key into ignition and turn ignition switch to ON. Waitapproximately 10 seconds. You will see the immobilizer warning lamp illuminate on the dash and you will hear an audible tone.Turn ignition OFF and remove the key.
3. Within 50 seconds insert the new unprogrammed key into ignition. Turn ignition switch to ON. After approximately 10 secondsyou should hear an audible tone and the immobilizer lamp will remain illuminated for 3 seconds. Once this occurs programming iscompleted.
4. For each additional key you must repeat these steps starting with step number 1.