Ruthie Shuster, who works at the franchise's location in the Pittsburgh suburb of North Huntingdon, serves up more than food on the go.
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She's offering smiles and even the occasional performance.
"On Fridays, about 30 come, and we all sing," she said.
This soon-to-be 100-year-old is easily the restaurant's most popular employee.
"I became a widow when I was 50. I've been working ever, ever, ever since. And I like working," Shuster said.
During the pandemic, Shuster said she missed the crowds that she would greet at work and after work activities.
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"I would go dancing four days a week. You can't go dancing nowhere -- there's no dances around," she said.
But she's still finding ways to connect with others and received a massive flood of birthday cards.
With so many birthday wishes, the company had installed her own mailbox on site.
Ruthie said the cards mean a lot and that said she plans to keep working.
"I get a payday," she said, laughing. "I get paid. I pay my bills, and that's good. I never had a lot of money, but I always have enough."