[Solved] Expire Session Question

When the user first login email or user name correct I set a custom session token

I when I set the token I would only like that token to last for 5 min then unset it self

How can I make sure that after 5min then only that session data will expire and unset.

PHP Code:

$this->load->helper('string');

$token = random_string('alnum', 16);

$session = array(
   'login_token' => $token
);

$this->session->sess_expiration = '14400';// expires in 4 hours
$this->session->set_userdata($session);

redirect(base_url('login/pwd/?token=' . $token)); 


PHP Code:

<?php defined('BASEPATH') OR exit('No direct script access allowed');

class Login extends CI_Controller {

    public function __construct() {
        parent::__construct();
        $this->load->library('form_validation');
    }

    public function index()
    {

        $data['title'] = 'Admin Login';

        $data['error_validation'] = '';
        
        $this->form_validation->set_rules('validation', 'Username Or Email', 'required');

        if ($this->form_validation->run() == false) {

            if (form_error('validation')) {
                $data['error_validation'] = form_error('validation', '<p class="text-danger">', '</p>');
            }

            $this->load->view('template/common/header', $data);
            $this->load->view('template/account/login', $data);
            $this->load->view('template/common/footer');

        } else {

            $this->load->helper('string');

            $token = random_string('alnum', 16);

            $session = array(
                'login_token' => $token
            );

            $this->session->sess_expiration = '14400';// expires in 4 hours
            $this->session->set_userdata($session);

            redirect(base_url('login/pwd/?token=' . $token));
        }
    }

    public function pwd() {

        $data['title'] = 'Admin Password Verification';

        if ($this->session->userdata('login_token') !== $this->input->get('token')) {
            if ($this->session->userdata('login_token')) {
                $this->session->unset_userdata('login_token');
            }

            redirect(base_url('/'));
        }

        $data['error_password'] = '';

        $this->form_validation->set_rules('password', 'Password', 'required|callback_validatepassword');

        if ($this->form_validation->run() == false) {

            if (form_error('password')) {
                $data['error_password'] = form_error('password', '<p class="text-danger">', '</p>');
            }

            $this->load->view('template/common/header', $data);
            $this->load->view('template/account/password', $data);
            $this->load->view('template/common/footer');

        } else {

            if ($this->session->userdata('login_token')) {
                $this->session->unset_userdata('login_token');
            }

            redirect(base_url('dashboard'));
        }

    }

    public function validatepassword() {

    }
}