The power door locks in my car suddenly stopped working. I can unlock and lock my doors with my key (though it's difficult, the key has never turned easily in the door), but the remote doesn't work, and pushing the buttons on the door feels wrong, like what's behind has shifted. I thought at first that it was just my driver's side, but the passenger's is the same. If I push hard enough the buttons toggle, but they don't lock/unlock the door. What should I do?