Locked out of car, how do I get into my car if I locked my keys in the car and the battery is drained?

I did not have a key fob, only a manual key which is locked inside. I've tried the air pump in the window, but it won't inlock due to the fact its battery operated, and my battery is dead. I don't know how to get into it. So basically, my car has the battery out with the hood completely closed, no key fob only manual key which is locked inside and can't get in. Please help.