Have 07 Altima w/keyless ignition. Locked myself out with ignition on. Now have dead battery and keypad will not open door. What should I do next? Thanks Joe

Yikes, not a good situation. I'm honestly not sure what you could do except call your local mechanist or locksmith. Hopefully someone else can give you a more detailed answer.

You should call a factory dealer. If the wrong steps are taken, you may lock yourself out of the theft system once power is restored.
Good luck.