Queued job doesn't execute the actual code - Laravel 5.8

I have a queued job, which must runs a code for importing data, like images. I have followed the docs about Laravel 5.8 for creating a job. First crete tables:

php artisan queue:table
php artisan migrate

Then create a job:

php artisan make:job CarsJob

CarsJob:

public function handle() {
    $cars = new CarsLibrary();
    $CarsLibrary->importAll();
}

Dispatching a job in the controller:

$importCarsJob = (new ImportCarsJob())->onQueue('import_cars');
$this->dispatch($importCarsJob );

OR:

$importCarsJob = new importCarsJob();
$this->dispatch($importCarsJob);

This is my env file for Redis:

BROADCAST_DRIVER=log
CACHE_DRIVER=file
QUEUE_CONNECTION=redis
SESSION_DRIVER=file
SESSION_LIFETIME=120
REDIS_HOST=127.0.0.1
REDIS_PASSWORD=null
REDIS_PORT=43216

This is config/queue.php:

'default' => env('QUEUE_CONNECTION', 'redis'),
'connections' => [

    'sync' => [
        'driver' => 'redis',
    ],
... other drivers like beanstalkd

    'database' => [
        'driver' => 'database',
        'table' => 'jobs',
        'queue' => 'default',
        'retry_after' => 90,
    ],


    'redis' => [
        'driver' => 'redis',
        'connection' => 'default',
        'queue' => env('REDIS_QUEUE', 'default'),
    ],

],

, but when I access the URL for the action with queued job, nothing happen, nothing is imported and there is almost no delay for the response (without queued job, it takes more than a minute ).

via Chebli Mohamed