My wife was driving home today in our 2004 Chevy Tahoe. She got it home but, in the driveway could not put the shifter into Park. As a result you also cannot remove the key. There's a few things I think it could be. Looking for some advice to narrow it down. I'm thinking it could be the brake switch, or the shifter interlock. I suppose it could also be the shifter cable, but I tried to move the shift lever manually and it did not want to go any further than reverse.