はいった後はドアを閉めなさい。

to enter; to go into; to break into; to join; to enroll; to contain; to hold; to accommodate; to have (an income of); to get; to receive; to score

later; afterwards; since; future; after one's death; descendant

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

door (Western-style)

indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.

to close; to shut

to do