What happens at the automated departure gates for travelers who are on overstay in Thailand?

When departing Thailand, if you are on overstay, the automated gates will remain closed, preventing your exit. Instead, you will be directed to a manned immigration desk where a staff member will assist you with paying the overstay fine. While there may be some delays, especially if the overstay is only for a few days, it is advisable to maintain a clear immigration record for future visits.