POWERED RUNNING BOARD CLOSED ON MY 5 YEAR OLD'S FOOT AS HE WAS ENTERING FROM THE PASSENGER SIDE REAR DOOR WITH BOTH DOORS OPEN ON PASSENGER SIDE. I HAD TO STAND ON THE PARTIALLY CLOSED BOARD AND APPLY PRESSURE TO EXTRACT MY SON'S FOOT. VEHICLE WAS PARKED IN A PARKING LOT WITH ENGINE IDLING.