Caramel-CRM/app/Providers/EventServiceProvider.php

<?php

namespace App\Providers;

use Illuminate\Foundation\Support\Providers\EventServiceProvider as ServiceProvider;
use Illuminate\Support\Facades\Schedule;
use App\Jobs\CheckInvoiceDueDatesJob;

class EventServiceProvider extends ServiceProvider
{
    protected $listen = [];

    /**
     * Bootstrap services.
     */
    public function boot(): void
    {
        parent::boot();

        // // TODO: read where to put these or ask in the forums
        // // it seems to work here, but where is the apropriate place?
        // // Kernel::schedule did not work
        Schedule::command('caldav:sync')
            ->everyMinute()
            ->withoutOverlapping();

        Schedule::job(new CheckInvoiceDueDatesJob())
            ->daily()
            ->withoutOverlapping();
    }
}