How do you open a heavy door sift heads world act 5

Well,it is easy.You need to roll until you heard the "pluck" and stop at the number where the pluck sound heard. After you heard the pluck sound,you need to roll it in another way and then you will heard the pluck sound again,then repeat it to the 3rd lock.Some heavy door contain hard 3rd lock,you need to hear the pluck sound carefully for the 3rd lock(for some heavy door)