This is the 2734th most frequent Polish word.
drzwiach
"Drzwiach" means "in the door" or "at the door" in English.
Here, 'drzwiach' (locative form of 'drzwi') is used to indicate the location where the key is situated.
Klucz tkwi w drzwiach.
The key is in the door.
In this sentence, 'drzwiach' (locative form of 'drzwi') is used to specify the position of a person relative to the door.
Zobaczyłem go w drzwiach wejściowych.
I saw him in the entrance door.
Here, 'drzwiach' is used to describe items situated within the cabinet door's area in a figurative spatial sense.