$header = true;
$file = '/path/to/the/csv/file';
if (($handle = fopen($file, "r")) !== FALSE) {
	while (($data = fgetcsv($handle, 1000, ",")) !== FALSE) {
		//skip header row of the csv
   		if($header){
          $header = false;
        }else{
          $user = \App\User::where('username', $data[0])->first();
          if(!empty($user->id)){
		 	$user->password = bcrypt($data[1]);
			$user->save();
		  }
        }
    }
    fclose($handle);
}