Open 24/7 for years, when Denny's closed for Xmas, owners found they they had lost their keys.
For years, Denny's was known for being open 24 hours a day, every day.
In 1998, Denny's decided, for the first time in 35 years to close for Christmas.
Since many stores had never been closed, the owners had lost the keys to the locks.
Some stores didn't even have locks on the doors.
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