Lock de-icer from a nearby hardware store/gas station? If not, then waiting is probably the best idea. If in a real jam and can't get something to blow hot air or lock de-icer, you could maybe get some hot water and pour it into the mechanism to see if it would melt any ice. I wouldn't trust it to not freeze again though until after a day or so in a heated garage so I'd only do that in a pinch.