Another option you have completely left out is instead of putting in a
french door, put in a dutch one. This way, you can play "store"
whenever you want to. Have your wife put some canned goods out on the
patio; and then you stand in the bedroom. She brings the canned goods
up to the door, and one by one, you pick them up and go "ka-ching!" (a
pretend store clerk with a pretend cash register) and put them in a
paper bag. Or she can stand behind the door, and you bring the canned
goods up to her. Alternatively, instead of canned goods, you can use
fresh, or not so fresh produce. If you use fresh, then whoever is
playing the customer can comment on how wonderful the produce is today.
If you use not so fresh, then the customer can complain, and ask for
their money back. Then, after you give them back the money, and they
turn their back, you make a face at them. When you stop and think about
it, the possibilities of what you can do are nearly limitless. What was
that TV show where they had a dutch door? Hmmmmm I don't remember now,
but it was very funny, because it was in a court or something, and the
wrong people were always going through it!