Sonic video Camera. It would be able to not only open doors, but also take pictures of aliens and recall important info about them. Maybe it should be able to edit videos as well...
I would have a sonic pen. Same operations as a sonic screwdriver,+1. If I am to write up something, it will appear and help me. As long as there is paper.
And I would mosr definently use it.
Sonic Jar of Dirt.
Then I can really say it's magical. :3