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Работа с useEffect

На отписку нужно отдавать ту же функцию что и на addEventListener

https://reactjs.org/docs/hooks-effect.html#example-using-hooks-1

  useEffect(() => {
    function handleStatusChange(status) { 
      setIsOnline(status.isOnline);
    }
    ChatAPI.subscribeToFriendStatus(props.friend.id, handleStatusChange);
    // Specify how to clean up after this effect:
    return function cleanup() {
      ChatAPI.unsubscribeFromFriendStatus(props.friend.id, handleStatusChange);
    };
  });

document.removeEventListener("keydown", (e) => handleClose(e));

используй обработчик как в примере или попробуй разобраться где ошибка

  useEffect(() => {
    const  handler = (e) => handleClose(e);
    document.addEventListener("keydown", handler);
    return () => {
      document.removeEventListener("keydown", handler);
    };
  });

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