Add this on your theme functions.php file then use this shortcode [sc_customer_logout]

sc_customer_logout.php

<?php
// Add this on your theme functions.php file then use this shortcode [sc_customer_logout]
add_shortcode( 'sc_customer_logout', 'sc_customer_logout' );

/**
 * Add a logout shortcode button
 */
function sc_customer_logout() {
	ob_start();
	if ( is_user_logged_in())  :
	?>
		<sc-button href="<?php echo esc_url( wp_logout_url( get_home_url() ) ); ?>">
			<?php esc_html_e( 'Logout', 'surecart' ); ?>
		</sc-button>
	<?php
	endif;
	return ob_get_clean();
}