public async void LoadScene(Scene sceneId)
{
    loadingScreen.SetActive(true);
    progressBar.value = 0;

    AsyncOperation operation = SceneManager.LoadSceneAsync((int)sceneId);
    operation.allowSceneActivation = false;

    do targetFill = operation.progress;
    while (operation.progress < 0.9f);

    operation.allowSceneActivation = true;
    await Task.Delay(2000);

    loadingScreen.SetActive(false);
}