huh, curious I have used wd40 on this manner a myriad of occasions never had an issue or a come back. I guess I must be pushing my luck.absolutely no WD-40, it will gum things up even more. A short burst of brake cleaner will clean the barrel of whatever is making it stick, it also evaporates quickly. follow up with graphite powder. In the mean time when the key is out and that warning goes off, simply press in quickly on the barrel and it usually pops right out and shuts up.