HELP! key stuck in ignition in ON position

[1978sierra]

Hey Guys,

I was driving around yesterday and when I went to start her up last night the key turned to the on position and nothing happened. No attempt to start no nothing. I then went to return the key to the off position and it was stuck. I can rotate the ignition a little bit- all the way forward and the 'brakes' light came on in my gas gauge (never seen that one before).

After about 10 mins of punching my dash, I took a deep breath and tried a bunch of things. One of which was to pull on the shifter leaver in the P position and try to turn the key-- It let the truck fire up and I got it home, once home though the truck was stuck in the ON position running. I fiddles with it a bunch and eventually it turned enough to kill the engine but still remains stuck and in the ON position.

I had to disconnect the battery to make sure it didn't drain out last night.

So here I am. Key is stuck in ignition, ignition is in the on position.

CAN ANYONE HELP ME!!!!!

it's a 1978 Sierra c15, no tilt, automatic on the column .

Cheers.