By 'automatic knife' do you mean a switch blade, or a spring-assisted knife?
Also, generally humans are not capable of magic, those that are are exceptions, and almost always have blood from a magical race in them. Reuben 'UnStellar' Kilos would need some sort of extenuating event or reason that would allow him to have magic.
And finally, a character that has both magic and the Force cannot use the two at once. For example, say you're using the Force to choke some poor bastard that pissed you off, you wouldn't be able to toss a magical fireball at him until you let him out of the Force grip.