08 Focus Ingntion barrel.

[First Time Ford]

Hello Ford fanatics, I have a problem. Purchased a 2nd hand 2008 Focus privately about 2 months ago. Excellent car with only 60K on the clock. Since week 3 the key did not turn all the way through to starter motor ignition. Sometimes it took 3/4 turns, some slow some fast to get the key to go right to stage 3 and kick over the engine. I thought this might have been a safety thing.. like foot on the clutch or foot on the brake to start the engine. Now the key does not turn to stage 3 at all. (sometimes after 15 mins of repeated turning it magically turns all the way). Any thoughts?? Is this a known Focus or Ford problem with the ignition / key barrel. Many thanks in advance.