system
A chat on subreddit /r/pcmasterrace
human
You can use the little SD card slot key or a paper clip (again, your phone needs to be OFF)
gpt
*Worked 5+ years in retail cell world. The amount of “broken” chargers I fixed with a paper clip. I loved the look of astonishment when a giant piece of lint falls out. 

I never turned the devices off and never had an issue?

EDIT: Might be better to error on the side of caution, powering off devices before working on them is safe for you and the device!