public function closeAllUnfinishedDrops(Dropzone $dropzone)
    {
        $this->om->startFlushSuite();

        $currentDate = new \DateTime();
        $drops = $this->dropRepo->findBy(['dropzone' => $dropzone, 'finished' => false]);

        /** @var Drop $drop */
        foreach ($drops as $drop) {
            $drop->setFinished(true);
            $drop->setDropDate($currentDate);
            $drop->setAutoClosedDrop(true);
            $this->om->persist($drop);
        }
        $dropzone->setDropClosed(true);
        $this->om->persist($dropzone);

        $this->om->endFlushSuite();
    }