How To Make Locked Containers

Like with the open and closed chests, the format is the same, but you will need to make a key to open it.

To make the locked chest, do the following

The Jewelry Box is a container.
The Jewelry Box is in The Classroom.
The Jewelry Box is locked.
The Jewelry Box can hold 3 items.
The Jewelry Box is fixed in place.
The Jewelry Box is openable.
The description of The Jewelry Box is "An ornate box!"

You must state that your object is openable, but if you state your box is locked, it can only be opened with the key. Without this your box will never be opened.

To make the key, do the following.

A Small Key is in The Hall.
A Small Key unlocks The Jewelry Box.
The Description of A Small Key is "A tiny gold key!"

It is a good idea to put they key in a different room, but it does not need to be. The keys and the containers can be called anything.