How to serialize User information in session

User.php

<?php

class User implements UserInterface, \Serializable
{
    /**
     * {@inheritdoc}
     */
    public function serialize(): string
    {
        return serialize([$this->id, $this->username, $this->password]);
    }

    /**
     * {@inheritdoc}
     */
    public function unserialize($serialized): void
    {
        [$this->id, $this->username, $this->password] = unserialize($serialized, ['allowed_classes' => false]);
    }
}