Sulu\Bundle\MediaBundle\Entity\CollectionInterface::getType PHP Method

    public function getType();

 /**
  * @VirtualProperty
  * @SerializedName("locked")
  *
  * @return string
  */
 public function getLocked()
 {
     return !$this->entity->getType() || $this->entity->getType()->getKey() === SystemCollectionManagerInterface::COLLECTION_TYPE;
 }