After pulling into a parking space and stopping, the braking system became unresponsive. While stopped with the foot on the brakes, attempts to place the car in park failed. After pumping the brakes, the car rolled forward as the car idled and the brakes were unresponsive as it rolled through a corrugated metal wall and the car only stopped after pressing the ignition button to turn off the car, putting anyone in or near the car at that time at risk. The problem has been reported to the dealer and the dealer inspection is pending but the problem has not been isolated and not reproduced. No prior warning lights or symptoms of a problem was noticed in this car before this incident.