Conversation Between sharkster and Gerry theSuisse

I have a 996 C4 2002. I left the car for 6 days and the remote keys don’t work. The mechanical lock with the keys also is dead. I can turn the key clockwise and anticlockwise 90 degrees but nothing happens.
I managed to open the engine hood from under the rear light which I found from a thread on the internet and then the alarm went on, horn and lights, indicating the battery is OK.
Now the rear visor light is constantly on and the keys still don’t work.
Any ideas how I can reset the keys or open the car?.