Squeezing 2,000 lemons a day was such a pain for staff at Chick-fil-A Inc. that the company enlisted an army of robots to do it.

In a plant north of Los Angeles, machines now squeeze as many as 1.6 million pounds of the fruit with hardly any human help. The facility, larger than the average Costco store at roughly 190,000 square feet, then ships bags of juice to Chick-fil-A locations, where workers add water and sugar to whip up the chain’s trademark lemonade.

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