How do you best build a mechanism where the door opens when you throw a lot of Jens in?
Ideally with a redstone comparator (I think it's called that), so assuming you have to throw in 10 gems or something else, you have to lay a red tone line from the comparator so long that if you throw in 1-9 gems, there's no signal at the end comes out, but if you throw 10 in, the signal arrives.
The comparator is connected to a funnel.
Of course, you also have to install a mechanism in front of it that the funnel can't clog, but you should know that if you want to build such a door.