That's when Keller sprang into action. He put his arms around his friend's abdomen and clutched until the food became dislodged, KSNW reported.
Keller told the TV station that his grandmother, a nurse, told him about the valuable first-aid skill.
"I just remember her saying something about it," he told KSNW.
The school lauded Keller in a Facebook post Friday.
"Thank you to Keller for being fast acting and giving the Heimlich to another student that was choking in the lunchroom," the school captioned a photo of the boy. "We are so proud of him!
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