Help with automation for smart plug?

Hi, I can’t get my head around how to make the following happen, but I’m sure it must be possible: I want to have an automation that turns a smart plug back ON one hour after it is manually (i.e. via app or Google home) turned OFF. I’m not smart enough to figure it out - anyone else more clever that could help? This is to turn my fridge and freezer off for listening to my stereo, but when do it manually, half of the time I forget to turn it back on again. Cheers!