How to use usePassword method in Zipper?

Please tell me how to use 'usePassword' method for extract zip file which is password protected.

   $files = array_diff(scandir($zipdir), array('..', '.'));
   $zip = new \Chumper\Zipper\Zipper;

   foreach($files as $key=>$value1){
       Zipper::make($zipdir.'/'.$value1)->extractTo($extractdir);
   }

Here in above code I want to usePassword method for zip extract using password, becuase the $value1 is zip which is password protected. But I dont know how to use this method for Zipper. Please help me.

Thanks in advance

via Chebli Mohamed