Do people in America really...

The rock protects it. Mine is also guarded by an elite team of commando squirrels.

I bet you're gonna ask where we live in your next thread!

I do that, in the UK.
Its come in very handy a few times.
How safe it is all depends on how well hidden it is i guess. You might have a half acre property to select a hiding place from.

I don't think anybody does that these days. Anyway sometimes a key is not even needed. Home invasions have taken over.

I keep an extra car key and the house key under my car. My wife does the same. I had to use it once after locking my keys in the car.

I do not
I dont know anyone who does
Give me your address so I can pop by sometime and we will see how well you hid the key👍

everything i own has a clap-on clap-off unlocking scheme. i keep the clapping sequence a closely-guarded secret.

My grandparents used to do this. They had a key hanging from a nail on their deck.