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  • I don't think the problem is that the lock is literally frozen, so hot water will probably do the same as cold water. Maybe the thermal change will shift things very slightly. But this is worth trying if the alternative is walking home.
    – Móż
    Commented Jan 12, 2016 at 20:34
  • Hot water would tend to soften any congealed lubricant in the lock. Commented Jan 13, 2016 at 2:30