Leaving toddler in the car to go into a shop.

[lbsjob87]

During discussions over dinner about our day, OH mentioned he'd popped into the Post Office to post an EBay parcel.
I said to DS "Did Daddy take you to see Postman Pat?"
He said "No, I in car".
DH then said "I was in and out in two minutes and I could see him all the time, it was quicker than getting him out."
Knowing the shop in question, this is possible, but even so, is it reasonable to leave a 2 year old unattended for even a few minutes? He had to get the parcel weighed so couldn't just drop it in the postbox.
He says he can't see the problem, and it's no different to paying for petrol and leaving him to go and pay.
(I try not to get petrol when DCs are in the car, and take them into the shop if it's unavoidable).
AIBU?

People just seem to have very different views on this topic.

If I could see the car and was able to park right outside I would do this provided car locked and toddler was not able to get of car seats.

If it makes you feel I comfortable just ask your DH not to do it again, for you. Not because he's 'wrong' or 'irresponsible' but just because it would make you feel more comfortable.

I would leave a child in the car to pop in the shop (as long as it was on same side of the rd as me) but not the petrol station. Can't understand why for some people it's the other way around. Surely being somewhere strange surrounded by flammable liquids and cars with their engines running is worse than outside a shop where if anything the kid will get out and run into the shop you're in.