Broken key in ignition!

What I've done is take a piece of thin gas welding rod, and wrap elec tape around a couple inches at one end as insulation leaving the tip bare. Place the bare, taped end of the rod into the ignition against the broken key, (the tape insulates against side contact) then brush (momentarily touch) a live 12 volt wire against the other end of the rod.

This will usually cause the rod to arc/fuse (weld) to the key, and you can generally wiggle the key stub out. Sometimes it take a few tries.

The rod can get warm/hot, so be aware.

Worst case if you supply too much power too long, is the key welds to the lock, and you're back to square one, taking the ignition switch to a locksmith...

This'll work on door/trunk keys as well.

hope it helps