Fetch custom post related to a User

I am trying to fetch custom post related to a User. I am using below code.

$args = array(
            'post_type'     = 'tasks',
            'meta_query'    = array(
                'relation'  = 'AND',
                array(
                    'key' = 'users',
                    'id' = $user-ID,
                    'compare' = '=',
                ),
            ),
        );

        $query = new WP_Query($args);
        $posts = $query-posts;

But I am not getting any output.