Had this problem in my old 2011 Murano. But it would unlock manually from the inside, or by key from the outside. It was a pain the pull the key out of the fob to get into the car. The keyless entry part of the fob and the switch inside would not work. Ended up being an actuator in the door. Dealership replaced it. Sometimes they just get bound up or need the cables greased, etc.. Mine was dead.