Just put it upside down and start shaking. Or hold it with the hole facing upwards and get the pick directly under the hole, then swiflty turn it upside down. Should fall right out.
Jiggle the handle. ;) No really – turn it over and shake. Is it a hollow body electric? Those holes are pretty small, so it’s harder – take a coat hanger and put some chewed gum on the end (not a whole piece… when you turn it over and shake, wait for the pick to fall over the hole – then use your McGyver rod to stick to the pick and shift it until you can remove it.
I usually hold the guitar hole up, shake the guitar until the pick is directly under the whole, then quickly flip the guitar the other way up and it falls right out. If that doesn’t work I hold it hole down and shake until it comes out.
get the pick on the hump so you can see it (right below the hole) then lift the guitar to get the pick airborne and pull the guitar towards you in one motion…I got pretty good at it over the years:)
If I had a dollar for every time I dropped a pick down the sound hole of my guitar…
That’s one reason I went for a no-pick style of strumming and finger picking.