When I turn the key in the ignition, it only turns halfway. this is the first time its done this. I've tried jiggling the steering wheel, wiggling the key, and doing both simultaneously. I've also tried 2 other spare keys. I don't want to force it in case the key snaps off while its still inside. What could be the cause, what part of the ignition isn't working, about how much would the part run, and would i be able to replace it myself?