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Do you have a key fob? If not and the key lock/unlock in the driver door did not work, try unhooking the battery and having the key in the ignition as far as you can turn it without having the engine crank, then hook up the battery and see if that works.
Try unhooking the hood latch connector
Ok, if none of these things worked, the only other option that I can think of is that your immobilizer has lost its programming. The only solution to that is to have the dealer reprogram it to your key. I'll open up the question to other experts, maybe they can help you.
My name is ***** ***** I would be happy to help. Can you please tell me if the engine spins over when you turn the key to start, or does nothing happen?
Do the dash lights come on when the ignition switch is turned to the ON position?
So it sounds like battery is dead. Have you tried hooking up a set of jumper cables to it to see if it will jump start? Let me know?