My question is what can I
use that is readily available, not extremely expensive, safe to use,
and will chill the can in seconds?

Immerse in *drained* ice or snow and spin. Maintain *pressure* of ice
against can. Drain the melt. *Spin* the can about 60 rpm with your hand.
This gets you below 40 deg F in a minute.

You must maintain the pressure and drain the melt, or you spoil the heat
transfer. The intimate contact with a phase-change substance is critical.