Routine was the exercise when a bike with a front quick release came in for service, we would test the quick release.
We would test the rear too in the stand but the front was the most common to be customer removed.
About 25% of the time the skewer was just wound tight.
We would show the person who dropped off the bike the correct procedure, then have them test "feel" the engagement.
Asked that the person who most often rode the bike to come with upon pick up.
Then show that person too.
Many an "AH Hah" moment.
Most of these bikes had manuals upon sale, rarely did they get read.
The second most common error was not understanding the brake QR to open up the caliper for the tire to pass.
We would always show buyers of a bike how to operate. People forget.