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The phrase "knock on" is correct and usable in written English
You can use it to describe the action of rapping or tapping on a door or surface with your knuckles, typically as a way to get someone's attention. For example, "I knocked on the door but nobody answered."
Dictionary
knock on
verb
To commit a foul by knocking the ball forward.
Exact(48)
They knock on doors.
Knock on their door?
Knock on the door.
"Just knock on his door".
I knock on the door.
Knock on wood, please".
Similar(12)
That has bad knock-on effects.
He made a knock-on-wood gesture.
Their absence, however, has knock-on effects.
That has had terrible knock-on effects.
A knock-on is a knock-on.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com