gałka do drzwi in English:

I turned the doorknob.

He groped for the doorknob in the dark.

I saw Tom wiping his fingerprints off the doorknob.

So he traded the paperclip for a pen, and then he traded the pen for a doorknob, and the doorknob for a Coleman stove.

I tried to open the door, and the doorknob came off.