Answer:
What object has keys that open no locks, space but no room, and you can enter but not go in?
If you are unsure how to use one then just ask a flight attendant.
What 2 things can you never eat for breakfast?
What goes inside boots and outside shoes?
What is often on the ground getting stepped on by others, but you donโt have to wash it because it never get dirty, in fact you couldnโt wash it even if you tried?
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.