pagination not working on custom static home page

I’m developing a Web site based on Customizr free and I need an home page with paginated custom posts.

In my child theme I added the front-page.php file and I set a static home page, everything works fine except for post pagination.

I use this code to get page index:

if ( get_query_var('paged') ) {
		$paged = get_query_var('paged');
	}
	elseif ( get_query_var('page') ) {
		$paged = get_query_var('page');
	}
	else {
		$paged = 1;
	}

and
the_posts_pagination(array('mid_size' => 2 ));
to display the nav block, but this is empty.

Any idea?
C.