Hello, how can i assignRole('user') $user in UserFactory for seeder ? (Laravel spatie roles & permissions))

public function definition() { $user = [ 'name' => fake()->firstName(), 'surname' => fake()->lastName(), 'email' => fake()->safeEmail(), 'email_verified_at' => now(), 'password' => '$2y$10$92IXUNpkjO0rOQ5byMi.Ye4oKoEa3Ro9llC/.og/at2.uheWG/igi', // password 'remember_token' => Str::random(10), ]; $user->assignRole('user'); return $user; }