title: Class 'App\Http\Controllers\PHPExcel_Style_Protection' not found on laravel
body: <p>In laravel I want protect cell, but a get error Class 'App\Http\Controllers\PHPExcel_Style_Protection' not found, I use MaatWebsite class. this my code</p>
  
  <pre><code>namespace App\Http\Controllers;
  use Illuminate\Http\Request;
  use App\Http\Requests;
  use App\Http\Controllers\Controller;
  use Maatwebsite\Excel\Facades\Excel;
  class ExportExcellDaftarhadirController extends Controller
  {
  Excel::create('exsport', function($excel) {
  $excel-&gt;sheet('Daftar', function($sheet){
  $sheet-&gt;getProtection()-&gt;setPassword('password');
  $sheet-&gt;getProtection()-&gt;setSheet(true);                                
  $sheet-&gt;getStyle('A12:B20')-&gt;getProtection()-&gt;setLocked(PHPExcel_Style_Protection::PROTECTION_UNPROTECTED);
  
      $sheet-&gt;loadView('export_excell.daftarhadirujian')
       });
      })-&gt;export('xls');
      }
  </code></pre>