Firestore is not returning any collection data in Laravel

The problem is that Firestore is not returning any collection data in Laravel. I am using the google/cloud-firestore package for this.

 public function __construct(LoggerInterface $logger)
    {
        $this->firestoreDB = app('firebase.firestore')->database();
        $docRef = $this->firestoreDB->collection('user')->document('7UUnkB6sSZgrBYazpmRlpCHJMZm2');
        $snapshot = $docRef->snapshot();
        if ($snapshot->exists()) {
            printf('Document data:' . PHP_EOL);
            print_r($snapshot->data());
        } else {
            printf('Document %s does not exist!' . PHP_EOL, $snapshot->id());
        }
        die;
        $this->logger = $logger;
    }


OR
 public function __construct(LoggerInterface $logger)
    {
        $this->firestoreDB = app('firebase.firestore')->database();
        $docs = $this->firestoreDB->collection('user')->documents();
        dd($docs);
    }

I want like print all document in collection and data for specific document.[]