Adding default role on registration with Entrust and Laravel 5.6

I'm trying to learn Laravel and I'm checking some ACL's along the way. Currently I'm testing Entrust/Zizaco and I'm trying to add default role when user is registered.

I've added this to the create function in RegisterController.php

$user = User::find($create->id);
$role = Role::where('name', '=', 'customers')->firstOrFail();
$user->roles()->attachRole($role->id);

This is full function

protected function create(array $data)
{
    return User::create([
        'name' => $data['name'],
        'email' => $data['email'],
        'password' => Hash::make($data['password']),
    ]);

    $user = User::find($create->id);
    $role = Role::where('name', '=', 'customers')->firstOrFail();
    $user->roles()->attachRole($role->id);
    return $user;
}

The problem is that the user is created but the role isn't assigned. No errors also. Can anyone help me a bit here?

via Chebli Mohamed