The actual switch is on the side of the column. The place you put the key, is connected to the actual electrical switch. Start by removing he plastic covers on the column. You should be able to see the switch and the linkage going from the key switch to the actual ignition switch. I have seen then get stiff as you describe, especially when bitter cold.
Pete's Ponies
Mustang RUSToration & Performance
1982 F100 Flareside
1983 Bronco