good tip and on target.i've been locked out this winter already and have done exactly what you said,a lighter is your last attempt.how-ever the little stainless door that is supposed to close and block the elements is broken or the spring is sprung so the opening is not sealed. i have a spare lock to install,but it's not on yet. i usually spray the locks on my cars twice a year.the grease volvo uses on the tumblers hardens over the years and it also collects dirt and debris.
--
83 242 DL -120k, 92-965-167k, 94-965-188k, 83-242 GLT-Gone, but not forgotten,83-245GLT-1'st one -the 1'st 3 currently on the road