[undecisive]

No, the power required to unlock the door (a small motor) is usually a lot less than the power required to ignite the fuel. You'll probably find that the radio and internal lights still worked too (though likely not for long).

[huffmsa]

To turn the engine. Lighting the fuel is easy enough. But overcoming the pressure inside the engine and getting ~50lbs of metal reciprocating and spinning from 0 to 1500rpm in a few seconds takes a bit of a kick.