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Discover LudwigThe phrase "a knock at" is correct and usable in written English.
It is typically used to describe the action of someone knocking on a door or another surface, indicating an arrival or request for attention.
Example: "There was a sudden knock at the door, interrupting our conversation."
Alternatives: "a tap on" or "a rap at".
Exact(57)
There was a knock at our door.
There's a knock at the door.
There was a knock at the door.
There is a knock at the door.
There was a knock at the window.
A knock at the door.
THERE'S a knock at a hotel door.
There was a knock at my window.
Then comes a knock at the door.
There's a KNOCK at the door.
There is a knock at the DOOR.
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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