Lanyard.
What??
In your pocket or on a table in your house.
Yes
Put the keys in your pocket.
They can fall out of your pocket or you could leave it in a shop.
he cannot breach the peace.
Keys, hands, money, comb, etc.
I was wondering where my car keys were, but then I found them in my pocket.
Take the keys out and put them in your pocket.
Under some circumstances, yes.
I keep my keys in my pocket.
No, there are at least 14 different sizes in which pocket watch keys have been made. The size used with a particular pocket watch depended on the size of the watch as well as the proclivities of the particular watch manufacturer. Jewelers and watchmakers typically have "bench keys" in their shop which can be used with various size and brand key wind/key set pocket watches.