Vintage ATCO is not far wrong.
Although there are no set down procedures for the situation, if we have an aircraft with a stuck mike at LACC and it seemed to be an ongoing thing, we would decrosscouple the frequency and simply transmit over the top of it. Ground Tx are far more powerful than airbourne ones so you can usually have some success in getting traffic to recall on a different frequency or revert to previous. Recieved transmissions are usually unreadable so continuing on the blocked frequency is not an option. Eventually someone notices that its gone real quiet or they want descent and the freq magically clears!!