I park in an alley alongside my office buildling downtown, that is closed off with a little swinging gate that has a lock built in. I've had no problems with my bike locks, but this gate lock froze up solid last week and I ended up carrying my bike up 3 floors to my office. No big deal. When I went into my winter jacket at home where I keep a little container of de0icer spray I discovered that after sitting there for a few years it had dried up. So it was a few days till I found a new contained of de-icer spray to carry with me on my bike, and then it warmed up enough that the lock came undone on its own! before I had a chance to use the de-icer spray. Well now I am prepared for the next time. We still have all of Februrary afterall.