Put key in ignition and it locked down. Steering wheel too

If it is a floor shift models it is a broken wire on the solenoid on the right lower of the shifter. Take the console out by unsnapping the trim from around the shifter and removing it. Next take out the screws (7mm, 2 of them on either side of the shifter) and there are 4 more of the same size inside the cubby in the console, exposed by lifting tthe cubby lid, emptying the crap out of it and lifting the felt up. Take all of the screws out and then move the shifter to the 1st gear position and remove a phillips head screw on the front of the shifter to remove the shift handle. Now lift out the console. You will more than likely see the broken wire when you look at the lower right side of the shifter close to the floor. Repair this connection by cutting all 4 wires leading to the harness plug and splicing 4 extra inches of wire to each and also repair the connection that broke out of the harness plug. The only option I found was to buy a fuel pump wire harness repair kit to get the connecters needed. The problem is that GM did not put enough slack in the wires leading to the shift interlock solenoid and when repeated drive to park shifting is done will stress this connection. Sometimes it will make it not disengage the shift interlock solenoid and you can not get it into drive from park, other times it breaks the wire for the key release. This should fix your problems, otherwise you have a problem with the BCM. SHould save you all a ton of GM service department spending.