Why "php artisan schedule:run" is executing only first $schedule->call() function ?

I have written a crawler that is taking some data from a website, and I want to run it everyMinute, just to test it.

Here is code

protected function schedule(Schedule $schedule)
{
    $schedule->call(function () {
        $crawler = new Crawler();
        $crawler->crawlVideos("someUrl",20);//20 is how many pages to crawl
    })->everyMinute();

    $schedule->call(function () {
        $crawler = new Crawler();
        $crawler->crawlImages("someUrl",20);//20 is how many pages to crawl
    })->everyMinute();

}

When I run php artisan schedule:run, it is crawling, it takes data and write them into DB, but ONLY from crawlVideos() function. If I change 20 to 2 or 3(how many pages to crawl), both functions are working, and I can see data in my DB.

Can someone tell me what is the problem ?