This sentence is a command, it has no subject and it cannot be changed to a passive sentence.
The door should be closed.
let the door be shut
The door was opened by whom.
The door was being knocked at by some body.
Yes, "is addressed" is in the passive voice.
Can it be changed into passive voice?
"They were surprised by a knock at the door." is passive voice.
let the door be shut
The door was opened by whom.
The door was being knocked at by some body.
This
To change a sentence into passive the sentence must be active. 'Shut the door please' is not an active sentence, it is an imperative sentence, it has no subject. You could write something like this - You are asked to shut the door - but this is a bit awkward.
The passive voice of ''what do you do'' is "what is done by you?"
"Your name is not known by me." is passive voice.
Passive voice
passive active A+
"The policeman chased after Fred" is active voice.
It is passive voice.