Doors won't unlock

G-542737

I came home the other day to find the back lights on on my 2011 Buick Regal. I pressed the lock button on the key fob and they went out, but the fob will not unlock the doors and I cannot manually unlock the door with the key. Any ideas?
 

BoostedRegal2.0

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2014 Regal 2.0 Turbo AWD Trifecta Tune
The key is mechanical it should work if the battery is low or dead. Spray some lubricant in the lock maybe it's bound up inside.
 
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