Ninja Rider,
A few things.
One, your '02 6r is not firecracker red, it's passion red. So better fix your profile.

The '01 Ninja 250's came in firecracker red, which is darker than the passion red.
Also, as far as the stuck lock, maybe some compressed air shot down into the lock might help jimmy something free, I don't know. You already tried lubing it, that would have been my first thought.
Your buddy should call the Suzuki dealer and ask them.
Also, does your buddy have two keys? Try the other key. Maybe the first key is bent or something.
Good luck.
-Flash
I'd call a locksmith before I tried drilling into the tank.
-Flash