Krixnaasphp /home/customer/www/example.com/public_html/foldername/artisan queue:work --stop-when-empty --timeout=60>> /dev/null 2>&1
Replace foldername with the name of the folder where the artisan is located. Generally, it is located on the root folder of the project (not inside public folder).
FOR Ubuntu:
- * * * * sleep 10; cd /path_to_your_project && php artisan queue:retry all >> /dev/null 2>&1
sleep 10; is for 10 Sec
