You might try a basic approach like using something like Liquid Wrench or PB Blast and gently working the key in the lock. It may be a rough spot on the key that is catching on a pin in the lock or it may be something altogether different.
Was the air temperature below freezing and could the lock have gotten water inside?
Your comment makes me think I had better check my outdoor TV door locks too
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Ed & Robin Lively
with Nina, Kitt, and Mickey
2016 Thor Synergy TT24 (a.k.a "Ming")
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