[0] Create demo project

composer create-project --prefer-dist laravel/laravel laraschedule

or using phpsandbox.io:

Template=Laravel 8

Title=laraschedule

[1] Create schedule command example

php artisan make:command MyTask --command=my:task

Outcome:

[2] Add task to do

Edit handle method:

    public function handle()
    {
        $dt = new DateTime();
        Log::info("Schedule runs at:".$dt->format('Y-m-d H:i:s'));
        return 0;
    }

Import class:

use Illuminate\Support\Facades\Log;
use DateTime;

Full codes:

(app\console\commands\MyTask.php)

<?php

namespace App\Console\Commands;

use Illuminate\Console\Command;
use Illuminate\Support\Facades\Log;
use DateTime;

class MyTask extends Command
{
    /**
     * The name and signature of the console command.
     *
     * @var string
     */
    protected $signature = 'my:task';

    /**
     * The console command description.
     *
     * @var string
     */
    protected $description = 'Command description';

    /**
     * Create a new command instance.
     *
     * @return void
     */
    public function __construct()
    {
        parent::__construct();
    }

    /**
     * Execute the console command.
     *
     * @return int
     */
    public function handle()
    {
        $dt = new DateTime();
        Log::info("Schedule runs at:".$dt->format('Y-m-d H:i:s'));
        return 0;
    }
}

[3] Register Task Scheduler

    protected $commands = [
        Commands\MyTask::class,
    ];

    protected function schedule(Schedule $schedule)
    {
        $schedule->command('My:Task')->everyMinute();
    }

Full codes:

(app\console\kernel.php)

<?php

namespace App\Console;

use Illuminate\Console\Scheduling\Schedule;
use Illuminate\Foundation\Console\Kernel as ConsoleKernel;

class Kernel extends ConsoleKernel
{
    protected $commands = [
        Commands\MyTask::class,
    ];    
    /**
     * Define the application's command schedule.
     *
     * @param  \Illuminate\Console\Scheduling\Schedule  $schedule
     * @return void
     */
    protected function schedule(Schedule $schedule)
    {
        // $schedule->command('inspire')->hourly();
            $schedule->command('My:Task')->everyMinute();
    }

    /**
     * Register the commands for the application.
     *
     * @return void
     */
    protected function commands()
    {
        $this->load(__DIR__.'/Commands');

        require base_path('routes/console.php');
    }
}