Can't.

Coconut "Shi..." He keeps his gaze down, honestly feeling bad. He starts to feel he and JinYi have something in common, something they fear revealing.
He aims to open that door a few times, without success. He studies the lock and creates a thin and short stick, like diamond, to use it to open the door. Unluckily they are Shiinden's locks, they are not easy to force, even for Deidara's student :v

Karm °They decided to take one twin for each, so they put us in the situation that if we go to the other parent it will be like betraying the one that chose us.
Yeah I know but what to do, I don't want to cause bigger issues. They are the adults so if they found this solution maybe it is the best one then. They certainly thought about us too.°

Boo_ «It's ridiculous. How dare they putting you in the middle of their disputes? I didn't think aunt and MoonBin were like that…» he grumbles.
«It doesn't look to me like the thought about you two, but only themselves. I know that there is nothing you can do, though, I'm just sorry for you.» He sighs.

LaNi. He watches Qi do, not having any better solution himself. «I don't know if it will be possible to break in… the Grand Temple is probably made so that nobody can force doors open. I hope we won't have to bother WuXin to come to do it.» He is a bit worried by the lack of responses from inside.

Coconut He keeps trying but it continues not to work. He gets more nervous as no noise at all comes from inside.
His hands tremble but at LaNi's words, he phones WuXin, asking him to come right away to open. The wait makes him more and more anxious.

Eventually WuXin arrives and opens the door for them. "...what is going on? Who is inside?"

Karm °I am accustomed to it now and you can know people well only when you know their true self.
Yeah that's like that, I like to think they did it thinking even a little about us.°