Disable caching via PHP for a specific page

you can use

do_action( 'litespeed_control_set_nocache', 'nocache for xxx reason' );

for example

add_action( 'template_redirect', 'lscwp_product_no_cache' );
function lscwp_product_no_cache() {
if ( is_product() ) {
do_action( 'litespeed_control_set_nocache', 'no cache for product page ' );
}
}

this will disable cache on product page