Jammed ignition cylinder lock

[Bowed]

2000 Silverado Z71 auto all power

The ignition cylinder/lock was starting to catch and once in a while would jamb a little . I removed the lock and had it rebuilt at a locksmith . I reinstalled the rebuilt lock and it was turning smooth with no jambs at all . last night I shut down the truck , placed the shift lever in park position , wiggled the steering wheel to check it was in locked position and then turned the key on/off 3 times to make sure everything was OK and it was still working perfect . This morning I got in ( touched absolutely nothing ) and the key will not turn no matter what I do . I don't understand what could do that . Again I touched nothing except locking the doors . I have tried moving the steering wheel all ways , pulling the shift lever while stepping on the brake , tapping the key and everything else and it won't turn . Does someone have an idea what is jambing this up . Is there any electrical locking function when you turn the key off ? Thanks