Is powdered graphite a safe lubricant to use in the ignition of a car?
 

I drive a 1997 Honda Accord and the wheel is locked and the key won't fit in the whole way. I've jiggled it bunches and put the gears in neutral and nothing unlocks the wheel for me to start the engine. This is a new problem.

Graphite is a conductor of electricity. Personally I wouldn't use it because it risks causing a short circuit somewhere, if it ends up where it's not supposed to.

graphite can't hurt, but it seems that you have a more serious problem

Give it a shot of WD-40. You may have to use something to hold the opening open. Sounds like one of the pins is stuck if the key won't go all the way in. Don't try to turn it so hard that you break the key in the lock. Also, don't try to force the key into the lock. I would try WD-40 and a hairdryer. Just to warm it a bit. But, in the end, call a locksmith before you damage it further.