Activate GUI Button with Enter Key

Right now, I can successfully change the focused button on my in-game pause menu by pressing up and down. However, I’m stumped as to how to implement a way to select that focused button via keyboard button press (The only way I can actually activate the button is clicking on it with the mouse). What is the best way to go about doing this?

If you know which button is focused at any time, you can look at Input.GetKeyDown(KeyCode.Enter) and activate whatever it would do.