How do I make a key pop up after clicking a button

[fading lynx]

I've seen this in rooms and wondered how they did it. Does anyone know how to?

[charred panther]

via costume jank

[remote crown]

Put one of those costumes down and make it cost something through configuring it then wire the button to it. But i think Rec Room is releasing a chip that allows you to do it and i THINK its already in beta