Power steering doesn't "lock solid," it becomes "much more difficult to steer." The only way steering "locks" is if the ignition turns to the point of locking the steering wheel, or something very catastrophic mechanically happens to prevent the mechanism from turning. I've had a full-size bus I was driving lose power while going down the freeway. It became MUCH harder to steer - I was leaning out of my seat, grabbing the wheel hard with both hands, and pulling HARD to keep it going where it needed to go, but it didn't "lock solid." It was simply much, MUCH more difficult to steer. My life and the lives of my passengers potentially depended on it though, so I made it happen.
Having my life or the lives of those around me depend on a crap "smart gun" firing when needed... there's no simple way to MAKE that fire if it loses power.