Why stun when you can push? Here is a cantrip for 5e DnD!
Fist of Force
Casting Time: 1 action
Components: V, S
Turning your hips, rolling your sholders, and punching with excelent form knocks a creature far away from you. Make a melee spell attack against the target. On a hit, the target takes 1d8 force damage, and it is pushed 10 feet away from you.
The spell’s damage increases by 1d8 when you reach 5th level (2d8), 11th level (3d8), and 17th level (4d8).