@christian1488
They don’t want to train their dogs with treats so yeah.
I mean, if they're not around to see you, I would just use treats anyways. Hotdogs, kibble, whatever they like. Maybe crate/leash them so you can deal with them one at a time?
You need to teach them the "wait" command. Try putting your hand on the handle or approaching the door, and stop/go back when the dogs lunge. Once there is hesitation (even a bit) praise them and let them out. Over time, increase the amount they have to wait, and what step you pause at (turning the door handle, opening the door a crack). It will be difficult without treats and having 3 of them, so you will need to have a lot of patience. If they have difficulty, try breaking it into even smaller steps to make it even easier.
Try different approaches to find what works best for you, there are plenty of ways to approach any problem, and if your parents' way doesn't work for you, you need to dive in and find your own path. It's something you'll have to figure out for yourself, but the ability to teach yourself a skill on your own is invaluable, especially if your parents are very much "my way or the highway" types.