My GF's car (VR V6) done this out of the blue one day, the ignition barrel is worn, it happened to her @ the shops. After pulling the entire thing to bits at the shop with no avail I got the shits and put force on the key and it worked. When I got it home I sprayed it with worth hhs2000 and its been fine since then (about 6 months ago). Will look into getting a new barrel one day!
Yeah mine did this about 3 weeks ago at the shops. I just fiddled around with it for a while. moved the key around in the barrel and kept trying to turn it. this went on for about 5 mins but it eventully started working and have not had a prob since.
Ignition barrel is worn. I tried using my spare key the other day and it wouldn't turn. The edges are to sharp on it, and the ignition barrel has actually worn to my old key. bit of lube should help things