Malo Stainless Steel Matte Fixed Knob, Ø70

This knob, like all others in the line, can be installed as a single-sided, double-sided, or reversible knob on wood, metal, or glass. Although primarily designed for interior or entry doors, there’s no reason you can’t install it on a closet door. It comes with mounting screws.
Installation is very simple. You’ll need to attach its base to your door, then secure the knob to its mount using a set screw.