Hi guys, this is kind of an idiotic situation, but I locked my trunk and now the key wont turn back to unlock it, any clue on how to unlock it from the inside?

What kind of Buick is it?

49 super 4dr sedan

I'm not familiar with the 49, but it might be possible to take the screws out of either the lock handle assembly and/or the latch assembly from inside. Short of that the only thing that comes to mind is to drill out the lock cylinder from the outside. Start with about a 1/4 drill bit dead on center and increase the bit size until the tumblers fall out. It should then be possible to unlock it with a screwdriver, then find a new cylinder and rebuild the unit.

Have you tried graphite?

no I havn't tried graphite, after playing with it enough the handle came out but it's still locked

See if you can into the trunk from the rear seat rest. Remove the seat rest, remove the lock. Take the handle to a locksmith, and see what he can do. Or just take the car there.