Command: php artisan schedule:run Not Working for 2nd?

我尽量每分钟给gmail发一封邮件。

My crontab: From here

* * * * * /usr/local/bin/php path/artisan scheduled:run >> /dev/null 2>&1

然后我在/App/Console/Kernel.php中设置函数Schedule:

protected function schedule(Schedule $schedule)
{
    $schedule->command('inspire')
             ->hourly();        
    $schedule->call(function () {
        $email = "My_Gmail_Receive";            
        $msg = 'example_view';
        $data = [];
        Mail::send($msg, $data, function($message) use($email)
        {
            $message->from('My_Gmail_Send', 'Hello');
            $message->to($email)->subject('Please checkout!');
        });
    })->everyMinute();
}

最后，我运行:$ php artisan schedule:run

则"My_Gmail_Receive"接收相应的消息。但它不是自动工作的everyMinute()。(当我运行$ php artisan schedule:run时，它只工作1次)

我怎么了?