cabinet, cupboard, shop counter
柜 centers on a piece of furniture for storage or display: a cabinet, cupboard, or shop counter where items are kept or presented.
柜 combines 木 (wood) with 巨, which likely contributes the sound. The character originally referred to a wooden container or cabinet.
A wooden 木 cabinet with a giant 巨 capacity: 柜 is a cupboard or shop counter made of wood.
For キョ, imagine a key cabinet: key -> キョ, and the wooden cabinet holds all the keys.