Laravel Kernel Task Schedule not working properly

I'm trying to use Laravel Task Schedule. So I create crontab -e which is like blow.

* * * * * cd /var/www/html/laravel && php artisan schedule:run >> /dev/null 2>&1

After this I bind my commands to Laravel's App/Kernel which is like below:

protected $commands = [
        //
        Commands\mitsui::class,
        Commands\sumitomo::class,
        Commands\nomura::class,

    ]; 

And schedule:

protected function schedule(Schedule $schedule)
    {
        $schedule->command('bot:mitsui')->everyMinute();
        $schedule->command('bot:sumitomo')->everyMinute();
        $schedule->command('bot:nomura')->everyMinute();
    }

Actually it's weekly but I'm trying to checking is it working or not. That's why make it everyMinute But actually it's not working. commands are not running. Do I missing something here?

via Chebli Mohamed