Automatically clear WP Native PHP Sessions older than 24 hours

wpnps-auto-clear-sessions.php

<?php

add_action(
	'init',
	function() {
		if ( ! wp_next_scheduled( 'pantheonx_clear_sessions' ) ) {
			wp_schedule_event( time(), 'twicedaily', 'pantheonx_clear_sessions' );
		}
	}
);

add_action(
	'pantheonx_clear_sessions',
	function() {
		global $wpdb, $table_prefix;
		$wpdb->query(
			$wpdb->prepare(
				"DELETE FROM {$table_prefix}pantheon_sessions WHERE `datetime` < %s",
				gmdate( 'Y-m-d H:i:s', strtotime( '24 hours ago' ) )
			)
		);
	}
);

Hello. Do I need to install any plugin in order to make this can run on my wordpress site?

and how to set to delete after 7 days?