door want open from outside unless hit

ok i know this has been addressed a few times but mines a little different , my driverside handle slowly started going out and i thouhgt maybe it wasnt closed so bumped it with my leg and it opened , well now its to the point i have to bump r hit my door harder and harder evertime i try to open it to get the handle to work . any ideas on what it might be and y hitting it fixes it .