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<?php
// Do NOT include the opening php tag

add_filter( 'genesis_footer_output', 'child_output_filter', 10, 3 );
/**
 * Custom Footer with shortcodes.
 *
 * @author Greg Rickaby
 * @since 1.0.0
 */
function child_output_filter( $backtotop_text, $creds_text ) {

	$backtotop_text = '[footer_backtotop text="Top of Page"]';
	$creds_text = wp_nav_menu( array( 'menu' => 'Footer Nav' ));
	return '<div>' . $backtotop_text . '</div>' . '<div>' . $creds_text . '</div>';

}