What is the mood of verb in this sentence Lock door when you come home?

The mood of the verb "lock" in the sentence "Lock the door when you come home" is imperative.

Here's why:

* Imperative mood is used to give commands or instructions.

* The sentence is telling someone directly to perform an action (lock the door).

* The subject "you" is understood but not explicitly stated, which is typical of imperative sentences.