iphone 6s jammed on apple logo

Force restart iPhone - Apple Support ⬅︎ TRY THIS, and if it does not work try Recovery Mode because if you can't get it to start properly then you have to have it serviced by Apple which you might not want to do and might not be an option right now...

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Force restart iPhone 6s, iPhone 6s Plus, or iPhone SE (1st generation)

1. Press and hold both the Sleep/Wake button and the Home button.
2. When the Apple logo appears, release both buttons.

Note: If iPhone still doesn’t turn on, or if it gets stuck during start up, see the Apple Support article If your iPhone, iPad, or iPod touch won’t turn on or is frozen.

Recovery Mode... the full info is in the above link...⬆︎ the short info is below...⬇︎

Connect your device to a computer. On a Mac with macOS Catalina 10.15, open Finder. On a Mac with macOS Mojave 10.14 or earlier, or on a PC, open iTunes.

iPad with Home button, iPhone 6s or earlier, and iPod touch (6th generation) or earlier: Press and hold both the Home and the Top (or Side) buttons at the same time. Keep holding them until you see the recovery mode screen.

It sometimes takes a few tries to get Recovery Mode...Once you get into Recovery Mode then your phone will be recognized...