May I suggest you set up 2 pinball machines inside in the front part of the shop that are set on free play or low cost such as $0.25 or $0.50 per game for customers to play {and for employees to play during break time or when off the clock}.
Perhaps machines like: Judge Dredd, The Getaway HS-II, TWD, WWFRR, ...and an e-m like Hocus Pocus so you can rip some spinners.

And try to always have 1 to 3 machines available for sale that are in good working order.

May want to train employees in first aid/cpr, and in dealing with heat stress/exhaustion and cold weather health concerns.

Provide employees with business ethics training, harassment awareness training, data security training, and appropriate workplace safety training.

Could train your employees on how to deal with situations when really bad people walk in pointing guns and demanding money.
I realize you are in law enforcement, so I figure you have a handle on that kinda stuff.