Problem with overwrite User3::all() method in User Mode

I have a User Model as:

<?php
 namespace App;
 use App\User;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Notifications\Notifiable;
 use Illuminate\Support\Facades\Notification;
 use Illuminate\Notifications\RoutesNotifications;
 use Notifications\EmailClientOfAccount;

class User3 extends User
{
use Notifiable;
public $emailList;

protected $fillable = [
    'name', 'email',
];

public function __construct($emails)
{
    $this->emailList = $emails;

}

public  function getEmailList()
{
     return $this->emailList;
}
public static function all(array $columns=[])
{
    return $emailList;
}
public function routeNotificationForMail($notification)
{
    return $this->email;
}
}

Then,and in Controller:

$collection = collect([ 
[ 'name' => 'user1', 'email' => 'user1@gmail.com', ], [ 'name' => 'user2', 
'email' => 'user2@gmail.com', ], [ 'name' => 'user1000', 'email' => 
'user1000@gmail.com', ],
 ]);

Second Stage: $u4 = new User3($collection); when I use :

dd($u4::all());

It show below error: ErrorException: Declaration of App\User3::all(array $columns = Array) should be compatible with Illuminate\Database\Eloquent\Model::all($columns = Array)

I very try for solve it, but dont, very Thanks for any help to me,

via Chebli Mohamed