Car Accelerates On Its Own problems of the 2014 Nissan Versa

Stopped at parking lot booth which was placed within one foot of sidewalk, preventing straightening of front wheels, which were turned to the left following a left turn into the lot. After payment through passenger window, I placed a foot on the accelerator resulting in sudden unexpectedly rapid acceleration and a lurch of the car to the left with almost immediate impact with a concrete cylindric post placed opposite the risen entrance gate within 2 feet of the front of the previously stationary car. The force was such to bend the rim of the front l wheel, striking of my head against the windshield, and the fracture of 2 metatarsals likely from impact with the brake.