A short door riddle

You enter the next room, as soon as you do your greeted by one of those signs again, you read it, " *Hello, if you have made it this far then congrats! Your half way through, at the end of this game you'll meet us and you'll have a chance to go home. So don't keep us waiting*"
Eclipse looks excited, I smile and nod at Eclipse, we continue.
As we look past the sign in the next room we notice that it's already lit up, with a locked door and keypad,
What do you use?