Neos\Flow\Core\LockManager::removeExpiredLock PHP Method

    protected function removeExpiredLock()
    {
        if (!file_exists($this->lockFlagPathAndFilename)) {
            return;
        }
        if (filemtime($this->lockFlagPathAndFilename) >= time() - self::LOCKFILE_MAXIMUM_AGE) {
            return;
        }
        @unlink($this->lockFlagPathAndFilename);
        @unlink($this->lockPathAndFilename);
    }