Wordpress: Sort users by numeric value in Users Screen @ https://foxland.fi/sort-users-by-numeric-value-in-users-screen/

functions.php

<?php
/**
 * Add new user column: Expire Date.
 *
 * @since  1.0.0
 * @return array $columns
 */
function prefix_expire_date_column( $columns ) {
	$columns['expire_date']   = __( 'Expire Date', 'text-domain' );
	return $columns;
}
add_filter( 'manage_users_columns', 'prefix_expire_date_column' );


/**
 * Adds Expire date and Status to column.
 *
 * @since  1.0.0
 * @return void
 */
function prefix_add_custom_columns( $value, $column_name, $user_id ) {
	if( 'expire_date' == $column_name ) {
		/* Get expire date somehow. For example using your custom function */
	//	$expire_date = prefix_get_expire_date( $user_id );
		$expire_date = $user_id + 1;
		$value = $expire_date;
	}
	return $value;
}
add_action( 'manage_users_custom_column', 'prefix_add_custom_columns', 10, 3 );


/**
 * Add sortable columns.
 *
 * @since  1.0.0
 * @return void
 */
function prefix_sortable_columns( $columns ) {
	$columns['expire_date'] = 'expire_date';
	return $columns;
}
add_filter( 'manage_users_sortable_columns', 'prefix_sortable_columns' );


/**
 * Sort by expire date. Meta key is called 'prefix_expiration_date'.
 *
 * @since  1.0.0
 * @return void
 */
function prefix_sort_by_expiration_date( $query ) {
	if ( 'expire_date' == $query->get( 'orderby' ) ) {
		$query->set( 'orderby', 'meta_value_num' );
		$query->set( 'meta_key', 'prefix_expiration_date' );
	}
}
add_action( 'pre_get_users', 'prefix_sort_by_expiration_date' );
?>