Newesguy

A couple of weeks ago I noticed that the rear door behind the driver didn't lock when I pressed the button on the door. And it does not unlock either. When I put my hand on that door to open, the car gives me beeping noises for several seconds, significantly longer than normal. If I even go to touch the door handle on that door, the car beeps, even if I just touch it and don't even try to open. I feel like before I noticed this that I accidentally held the button on this door for a longer time than normal. I don't know if I disabled the lock by doing this or what. Since then, I have just reached inside the manually locked and unlocked that door. Also, now when I go to open any door, the car beeps significantly longer than it normally did. It seems like more of a warning beep than a door opening beep by the length of the beeping. Does any of this make sense? Any advice?

Thanks!