SATURDAY, JANUARY 20, 18:55(APPROXIMATELY) AMHERST MASSACHUSETTS, 39 DEGREES FAHRENHEIT PARKED CAR, PULLED KEYS AND EXITED CAR TO HELP MY MOTHER EXIT. PARKED ON INCLINE, VEHICLE STARTED ROLLING BACK DOWN DRIVEWAY HAD KEYS IN POCKET AUTOMATIC TRANSMISSION VEHICLE TRIED MOVING BACK TO DRIVER DOOR WHICH HAD LOCKED OR WAS STUCK USED ALL STRENGTH TO TRY TO KEEP VEHICLE STATIONARY, WITHOUT MUCH H SUCCESS FINALLY, MOTHER WAS ABLE TO OPEN DRIVER DOOR FROM INSIDE I AM 53, WITH MILLIONS OF MYLES UNDER MY BELT....MOTHER IS 73 BOTH OF US STRAINED OURSELVES, KEEPING VEHICLE FROM MOVING. VEHICLE WAS PARKED ON PRIVATE, SLIGHTLY DESCENDING DRIVEWAY VEHICLE RENTED FROM ADVANTAGE RENT A CAR CALLED RENTAL COMPANY AND WAS NOT HELPED WE ARE STILL VERY SHAKEN FROM THE EXPERIENCE WILL NOT DRIVE VEHICLE AGAIN NO VIDEO FOOTAGE, JUST MY MOTHER AND I EXPERIENCED MALFUNCTION