Keycard fault???

Hi there ive got a 54 plate Renault megane scenic, I opened the car and moved it off the drive fine came to locking it and my keycard doesn't work. I then tried to move it and the car won't start at all, a message flashes up very quickly either auto brakes activated or auto lights activated, i now cannot push the brake down as it is stuck and after a few attempts of trying to re start all the lights/dash board have gone off altogether, so I'm left with a car that doesn't lock with the brake permantly on and no lights on the dash..? Any help greatly appreciated thank you