Converting unix timestamp to Milliseconds in luxon.js

I have string data in the format "hh:mm" e.g. 05:00. I want it in Milliseconds e.g 1800000

console.log(DateTime.fromISO("05:00") and i get the following output: 1654574400000 but what i want it in seconds so i can compare it against a different value. I have tried putting .toMillis() at the end
console.log(DateTime("05:00")).toMillis();
and it comes back with "Unhandled Rejection (TypeError): Class constructor DateTime cannot be invoked without ‘new’".

>Solution :

Have you tried .ts at the end and formatting