'Full lock-down' has been implemented in a number of cities around the world in the the course of the pandemic and the rules of course vary from city to city. But in broad terms it means you
must stay at home and not leave the house without good reason, subject to a few exceptions and concessions. That's not just a night-time curfew; it's
stay at home 24/7. The residents of Melbourne are very familiar with this condition and they are currently experiencing a snap 5-day lock-down, announced last Thursday. The 5th time lock-down has been imposed there. The rules are summarised in this article;
https://www.abc.net.au/news/2021-07-...mic-/100296392. Work from home, shopping for food only once per day, limited outdoor exercise. That's it.
So, in Thailand, if full lock down means something similar, then it doesn't matter if the bars and beaches are open or closed:
you must stay at home. As for the possibility of ordering food delivery from restaurants depends on whether they are allowed to continue operation to provide such a service, or indeed if they believe it to be economically viable (Ref the Silom Soi 4 thread). The likes of McD's and kitchens turning out Thai dishes will probably continue to operate in some form, but whether you will be able to order a meatloaf from Yupins remains to be seen. If you aren't capable of rustling up meals from fresh and basic ingredients, you might be living on cold sandwiches and fruit pies from 7/11 for a while.