'providers' => [
    ...
    \Adeliom\Lumberjack\Cron\CronProvider::class
]

<?php

namespace App\Tasks;

use Adeliom\Lumberjack\Cron\Cron;

class ExampleCronEvent extends Cron
{
    public $every = [
        'seconds'   => 30,
        'minutes'   => 15,
        'hours'     => 1,
    ];
    
    public function handle(){
        update_option('last_ran', current_time('mysql'));
    }
}

return [
    'register' => [
        ...
        App\Tasks\ExampleCronEvent::class
    ],
];