HELP: Car can't turn on

ultimeaciax

I have a 2009 370z and out of the sudden it won't turn on

The steering is fine, but the brake is completely locked. I tried putting in the fob but no luck either. The car is completely shut off - all I see is some lights flickering, especially the brake light.

In short, these are symptoms:
-I can't lock or unlock my car - except when I use the key in fob
-Brake is locked
-Steering wheel is not locked
-Few lights are on and won't shut off
-I can't turn on the headlights
-Nothing else is responding

EDIT: I went out and try again and the ignition said LOCK. I inserted the fob in the slot again and it asked me to press brake and press the ignition. When did and there's stuttering sound as if the car trying to turn on. Thus, I'm thinking that my battery is probably dead. However, I didn't leave anything on to deplete the car's battery.