D8-getting current moderation state

gistfile1.txt

use Drupal\grievance\Entity\GrievanceEntity;
$grievance_id = "4";
$grievance = GrievanceEntity::load($grievance_id);
$grievance_vid = \Drupal::entityManager()->getStorage('grievance')->revisionIds($grievance);
$latest_revision_id = array_pop((array_slice($grievance_vid, -1)));
$grievance_revision = \Drupal::entityTypeManager()
  ->getStorage('grievance')
  ->loadRevision($latest_revision_id);
$current_state = $grievance_revision->get('moderation_state')->getValue()['0']['value'];
kint($current_state);exit;