Fast-food chains are going old school with an innovative customer service update: human cashiers.

The push for touch-screen kiosks, mobile app deals, and digital ordering has been sweeping across favorite fast-food chains for years.

McDonald’s, Burger King and Starbucks have all offered exclusive in-app promotions to nudge customers online, while installing self-service kiosks in place of traditional counter service. But after facing customer frustration and growing demand for personal service, these chains are beginning to backtrack.

Self-pay kiosks have been a deterrent for some customers, whether it be price surges at Shake Shack or forced…

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