YOU SAID:

The school just closed, finally.

INTO JAPANESE

学校はやっと閉校したばかりです。

BACK INTO ENGLISH

The school has just closed.

INTO JAPANESE

学校は休校したばかりです。

BACK INTO ENGLISH

The school has just been closed.

INTO JAPANESE

学校は閉鎖されたばかりです。

BACK INTO ENGLISH

The school has just been closed.