It sounds like you're doing everything right. Just like kids though, they will learn what will work to get you to do what they want so they're learning if they cry long enough, you'll open the door. You might just have to bear through the crying and stand firm on keeping the door closed until you're ready to open it so that they learn. They are kittens though so they're going to be playful and crazy. Also, spaying them should help a little but even then, it will probably take a while for them to simmer down.
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