Locked Out of Car

[Nobby Diesel]

Any ideas on how to get over this?
Car has been left for a week, so the immobiliser has gone into low energy mode.
The trouble is, unlocking the car manually with the key isn't working, so can't open any either door.
Alarm is still set and the red indicator light is functioning.

How do it get it unlocked?

Car is a 2001 996 turbo.

Thanks in advance folks.