bondnm

When parking my car this morning and going to lock the car with the fob nothing happened. I have tried to then lock the car with the key manually but its only locking the drivers door and leaving all the other doors and the boot open. I have tried everything but cannot get the fob to work The car is a 52 plate and I have never had the battery replaced or changed since buying the car. Is this just a case of the battery in the fob going or something else?