Emergency steps
Garbage Disposal Humming but Not Turning: What It Means

A disposal that hums but does not spin usually means the motor is receiving power but the blades are jammed or the motor has overheated and tripped its internal reset - turn off and unplug the unit before attempting to clear a jam with an Allen wrench in the bottom center hole, and stop if you smell burning or the hum continues after a jam is cleared.