My scion 2005 xa ignition key will lock and sometimes won't turn over.

It's actually a feature, not a bug. Many years ago, it was mandated that a vehicle's steering wheel could not be allowed to turn when the key was not in the ignition (which at the time killed the all-cool dash mounted ignition!). The mechanism used in most cars to "lock" the wheel also will back-drive the ignition cylinder in some instances. I've found it happens more if I turn the key to the key-removal position while I'm still applying turning pressure to the wheel.