How to configure api vk vk-ruby?

Question

ruby

Guys help me set up api vk through vk-ruby.
I'm trying to do it like this:

require "vk-ruby"
app_id = 664921213134
secret_token = "IHi***********Mu"
access_token = '9eb9ef6d469aec89c2edd6*******************dc1266e233f9c0f10854fe975add9aa188e0decc9a1b89'
x = VK::server_auth(app_id: app_id, app_secret: secret_token)

gives an error message

description='Application authorization failed: access_token has expired.' (VK::APIError)

Maybe someone has a ready-made script example how to do it right