How to capture the “enter” key as input in a Bash script?

When using the select command, there is usually *) which would capture anything not in the select menu and run whatever code follows, sort of an error checking strategy.

varone="Test one"
vartwo="n"
PS3=$'nEnter one above: '

select rb in "$varone" "$vartwo" "Exit"; do
    case $rb in
        "$varone")
            echo "bingo"; break;;
        "$vartwo")
            echo "bango"; break;;
        "Exit")
            break;;
        *)
            break;;
    esac
done

This requires an input and enter key.

Can this be setup in a way that would capture the enter key alone as input. Without the need to provide any other key press; the enter key alone would trigger the select commands code for that menu option?

I’ve tried some things like assigning $'"n"', n, rn, '' etc to the vartwo variable to no avail.