Lost my keys this morning immediately after unlocking the car

Searched everywhere for at least 20 minutes.
Where could they have gone? Unlocked the car, put stuff in the back, no keys.
Totally flabbergasted. Searched in the car, searched under the car, not on the roof.
Went inside to get a torch as it was gloomy, (had spare house keys hidden outside), re-searched again. I give up.😟
Found them in my back pocket with my wallet. 😄