Locks and lockpicks

[Naamandre3]

So it would be allowed to use pistons to have a block over a chest?? Because idk about yall but that sounds cool, I really wana make a huge chest room, all well organized and using pistons Im doing it regardless of rules!

According to me.
You can make an elaborate redstone system for a lock combination to enter your vault.
Then an elaborate piston system to open and close chest rooms by having to place buttons and thus know where they are.

But, using a piston to push a block over a chest so it cannot be opened.
Nope,