Pagination problem – displays the same posts on each page

I know this is a common problem, but I am not familiar enough with PHP to adapt any of the many examples to fit my custom loop. I have sorted my loop to display one category called Classes. I am also sorting posts by date using custom fields. But the pagination shows the same posts on each page. I know the query_posts is what is breaking it, but I don’t know how to fix it.

Here is my loop code:

<?php if ( have_posts() ) : ?>

	<?php
	$todaysDate = date('m/d/Y H:i:s');?>

<?php query_posts('showposts=5&category_name=classes&meta_key=Date&meta_compare=>=&meta_value=' . $todaysDate . '&orderby=meta_value&order=ASC'); ?>
			<?php while ( have_posts() ) : the_post(); ?>

	<?php
	get_template_part( 'content-home', get_post_format() );
		?>

	<?php endwhile; ?>

	<?php _s_paging_nav(); ?>

	<?php else : ?>

	<?php get_template_part( 'content', 'none' ); ?>

	<?php endif; ?>