Sending queued email

SendInvoice.php

<?php

namespace App\Jobs;

use Illuminate\Bus\Queueable;
use Illuminate\Queue\SerializesModels;
use Illuminate\Queue\InteractsWithQueue;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Foundation\Bus\Dispatchable;
use App\Models\Invoice;

class SendInvoice implements ShouldQueue
{
    use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;

    protected $invoice;

    public function __construct(Invoice $invoice)
    {
        $this->invoice = $invoice;
    }

    /**
     * Execute the job.
     *
     * @return void
     */
    public function handle()
    {
        $pdf = \App::make('dompdf.wrapper');
        $html = view('site.partial.invoice', [
            'invoice' => $this->invoice
        ])->render();

        $pdf->loadHTML($html);
        $pdf->save(storage_path("invoices/invoice_{$this->invoice->id}.pdf"));

        \Mail::send('site.email.invoice', [], function($message) {
            $message->from(env('MAIL_USERNAME'), 'Cottonfair');
            $message->to($this->invoice->email)->subject(trans('site.invoice.subject'));
            $message->attach(storage_path("invoices/invoice_{$this->invoice->id}.pdf"), [
                'as' => 'invoice.pdf',
                'mime' => 'application/pdf',
            ]);
        });
    }
}