Norman Nemanishen

I have had my XK8 coupe under cover since early December 2020. I took the cover off to start the car. The fob didn't work and I replaced the batteries in the fob. This didn't open the doors, so I put the key into the drivers door and although there was a click the door didn't open. I tried the key in the boot lid but this didn't open the boot. I need to access the battery in the boot. Any constructive advice would be appreciated. A