This is the 11799th most frequent Russian word.
закрыто
Closed.
Here, 'закрыто' is an adjective used predicatively to describe the state of the shop being closed.
Магазин закрыто.
The shop is closed.
In this sentence, 'закрыто' describes the closure of the entrance, giving information about its unavailability.
Вход закрыто до окончания ремонта.
The entrance is closed until the end of repairs.
Here, 'закрыто' is used in the past passive participle functioning adjectivally to describe the state resulting from an action.