Why does withTrashed not exist?

Question

Laravel

My code

public function restore($params)
    {
      return  User::withTrashed()->find(6)->restore();
    }

my model

class User extends Model
{
    use SnakeCaseToCamelCaseTrait, SoftDeletes;

    protected $table = 'users';
    protected $guarded = ['id'];
    protected $dates = ['created_at', 'updated_at', 'deleted_at'];
}

Error
"Method Illuminate\\Database\\Query\\Builder::withTrashed does not exist."