Random select value on array factory Laravel

I had user migration:

$table->enum('type',['seller','buyer'])->default('seller');

I want when using ModelFactory how to get random value seller or buyer?

$factory->define(App\User::class, function (Faker\Generator $faker) {

    static $password;

    return [
        'firstName' => $faker->name,
        'lastName' => $faker->name,
        'username' => $faker->unique()->username,
        'email' => $faker->unique()->safeEmail,
        'password' => md5('user123'),
        'bio' => $faker->sentence(3, true),
        'type' => ???,
    ];
});

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