How does do_action( ) works actually?

wpas_after_ticket_submit is the hook name, not the function name. Functions are hooked to it with add_action() by setting the first argument of add_action() to wpas_after_ticket_submit, and the function name as the second argument:

add_action( 'wpas_after_ticket_submit', 'function_to_hook' );

So you need to find a use of add_action() where the first argument is wpas_after_ticket_submit. The 2nd argument would then be name of the actual function that is hooked.

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