Does the steering wheel still Lock when key is in ACC or OFF position?
The actuator rod may be broken which is not an easy fix, not technical just alot of wrench work, steering wheel has to come off
Picture of part of actuator rod:
https://i.ebayimg.com/images/g/j-wAAOSwiZVbffwg/s-l300.jpg
On the key part there is a gear, when you turn the key the gear slides the rods teeth up or down the column sliding ignition switch into its 4 positions
If the gear or rods teeth are damaged then it can't slide ignition switch
Steering wheel lock also uses actuator rod movement, it may or may not be effected
If you want to get truck started to move it then you can pull out ignition switch, above brake pedal, and slide it into position manually, to start it and then to shut it off, unhook battery after shut off
Video here on getting at ignition switch:
https://www.youtube.com/watch?v=j3I2oye8OpQ