Dyna 2012 fxdwg fork lock stuck

I bought a used 2012 fxdwg couple months ago, and noticed too late that the fork lock seems to be stuck. It doesn't go down fully and thus it wont rotate and lock the fork.

I have tried cleaning it with wd-40 and applying lock and gun oil, but it didn't help. Does anyone have any experience on this, and if so, is there maybe something I overlooked?