Enforce a firm

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Russian - Ukraine, Kiev
And because I’m watching the screen so closely, I start bagging my groceries late, fumble with my wallet, and awkwardly leave my shopping cart blocking the lane like a metal crisscrossed castle knight enforcing a firm “Thou shall not pass” law in its trademark silence.
What is the meaning of "firm" in this sentence?
It's from "The Book of Awesome"?
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