It depends on the state. If you entered your SS while making the liscence you can try renewing online or through mail. When I renewed mine, I wasnt asked for any i20. This was in MA. They dont have a way to check the validity of  thing. Just take your old one. No one will find out. What you can do is scan the third page and then put the extention date on the page in photoshop and sign it. Its just bored people working there anyways. If you are not successful one time, go to another branch. Dont fuss too much.
One more thing, In texas you can mail the renewal if you are currently out of state and cant be there phycically. There is info somewher at Dmv website. Have your friends somewhere out of state get the mail.