You do not get that key during the quest. The key that is eventually dropped in MacGuffin's fits the back room at Good Deals next door.
It is the Quick Charger, in a display just to the right of the door.
Turn off the alarm probably, or run away- depends on are you supposed to be there?
It doesn't fit the door at MacGuffin's. Try next door at Good Deals. You can use the toy robot to keep the lights on.
The "Back Door" key fits the employees-only door at Good Deals Electronics. (use the toy robot by the camera to keep the lights on)
The Employees Only room in Good Deals. You can use the toy robot by the camera to keep the lights on.
The thief drops the key in MacGuffin's but it doesn't fit the back door there. Go next door to Good Deals and try that door. You will need to use the toy robot to keep the lights on.
There is no key to MacGuffin's or its back room. The key that you do recover fits the back room at Good Deals next door.
The one at Good Deal Electronics, just next door to MacGuffin's where you surprised the robber. Use the toy robot by the camera to keep the lights on.
Once you have the key that says "back room" you only have to go next door to Good Deals, and use the toy robot by the camera to keep the lights on.
It doesn't fit the back room at MacGuffin's so you should try next door at Good Deals electronics. Use the toy robot by the camera to keep the lights on.
Not the back room of MacGuffin's, but the Employees Only room at Good Deals next door. Use the toy robot at the camera to keep the lights on.
It opens a "back room" somewhere. Since it's not MacGuffin's, try next door at Good Deals. You will need to use the toy robot to keep the lights on there.