Active to Passive voice: "Go to School Now"

How would you convert the imperative sentence: "Go to school now."
to the passive voice?

While discussing it in class, our teacher gave the following solution:
"You are ordered to go to school now."

However, I felt that this must be wrong, since the sentence is still in the active voice. It seems to be in the passive voice with reference to the verb 'order', but we need to convert the sentence with respect to the verb 'go'.

I thought of a solution:
"Let you be gone to school now."
or
"Be gone to school now."

Are any of them correct? And if not, how would you convert the sentence into passive voice?

Edit:

Just realised that 'go' is an intratransitive verb. Does that mean that there won't be a passive version of it? As mentioned here:

You CAN'T. You can only turn into passive verbs those verbs who can have the "direct object".
For example:
I eat (what do you eat?) an apple
I see (what do you see?) a bird
I read (what do you read?) a poem

But if you say : I go, you can't ask "what do you go", because it doesn't make any sense! And that's why you can't write that in passive voice.

Edit II:

How about "Let the school be gone to by you."?

Andrew Leach's explanation is sound as far as how you might go about doing this, but the answers all sound awkward and goofy. I think this points to a bigger point that you shouldn't do this.

Consider the reasons for using passive voice. The whole idea of passive voice is inverting the emphasis between subject and object, so it just doesn't make a whole lot of sense to do in imperative sentences.

A suitable reference is English Practice.

Where the verb is intransitive, as you note, the passive form is different. To create the passive, you need an object to turn into the subject of be.

Active: Bring it home.
Passive: Let it be brought home.

Active: Please help me.
Passive: Let me be helped.
Passive: You are requested to help me.

Active: Get out. (No object)
Passive: You are ordered to get out.

A fundamental property of a passive construction is that the agent (that is, the person who is actually doing the bringing, requesting, or ordering) is not stated. All we know is that an action is done — bringing something home, helping me, or an order to get out.

In an imperative sentence like "Go to school now," there is an implied subject and object which can be made explicit in an obviously active-voice sentence: "I order you to go to school now." When that is made into a passive construction, the I is lost and the sentence becomes "You are ordered to go to school now."