Greetings to the Group!

I am looking for a bit of advice from folks that may have "been there and done that."
We own a '89 260E which is a great first car for the kids. On Monday they took the car to work, on the way they stopped for gas. That's when I got the call - "Dad the car won't start..." Needless to say I stopped by the filling station and began working the issue. Indeed the car would not start since the ignition switch was locked up tight! I did move the gear selector from Park to Neutral a few times to no avail. While in park I did try rocking the car - sometimes the extra weight the doc wants me to lose does come in handy. I noticed the car did roll quite a bit, about a whole foot whilst in Park. I placed the car back in Neutral and pushed it a few feet, once it stopped rolling I placed the gear select into Park. At that point I was able to turn the key, and the car came to life.
I was able to drive the car ALMOST all the way home. Exactly 1.1 miles from the house the car died - no warning. I made a right turn and was accelerating when the entire dash lit up and the motor stopped running.
Luckily I placed the trans in Neutral and was able to coast into a parking lot. So now the car is sitting in the lot and the key will not turn, again. The car is Park and there is no rolling it, it does roll in neutral. I cannot tow/push/pull it home since the steering wheel is locked. I am trying to avoid spending on a tow that is literally 1.1 miles

Only after this experience was I told that we did experience the "hard to turn key" phenomenon a few times this summer. Ironic - Dad is always last to know...

Any suggestions as to how I can cure it's current immobility? After all the poking around I have not found a solution to removing the ignition switch AFTER it seizes up...
Gotta love it.

Thanks in advance.