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Battery is dead, been there done that, jump it -then consider if you need a new battery. Not sure how long you had the doors open but if it was not an obscene amount of time you need to consider the strength of your battery. How old is it?
When they installed the remote start/alarm on my '05, they neglected to put a trickle charger on the battery and ran my batteries almost dead. It was just enough to start the truck and it took the whole drive home to recharge.
Pull the battery, check the date and make sure it's not too old, make sure it's topped off with distilled water if necessary, slow charge at autozone or oreilly if you don't have a charger and you'll be good to go.