With the alarm going off all night did it kill the battery and thats why your doors will not open? Or does the car have power and it just cranks without starting up?
Like sperf said, the alarm could be disabling your fuel pump causing your cranking issue.
You can try a battery reset which reset all the moduels in the car.
Disconect both + and - battery terminals, get a long screw driver or a extesion and connect both battery calbes together, let is sit for about 10 minuets or longer if you see fit. Reconnect to the battery and try to start it.