The key cannot be removed from the ignition. I have taken my truck to my local mechanic and he can't find the problem

I DRIVE MY CAR TO WORK WENT TO GET OUT THE KEY WOULDN'T COME OUT OF THE IGNITION SO THE DASH LIGHTS STAYED ON AND WOULD RUN DOWN MY BATTERY SO I HAD TO TAKE OFF WORK AND GO THE THE GARAGE TO GET IT OUT THEY HAD TO REMOVE THE COVER ON THE STIRRING COLUMB SO NOW I HAVE TO PUSH A LITTLE BUTTON TO GET THE KEY OUT THE MACHANIC SAID IT MAY BE ELECTRONIC OR A BROKEN PART BUT IT WOULD COST ME ABOUT $70.00 THEN IT WOULD WORK TO LOCK THE WHEELS