..and drop your expensive headset on the floor....
Ah there speaks the voice of experience me thinks
But more seriously the 172 park brake is not that bad compared to some others in the GA world.
Generally on most types I only used to set the park brake on after engine shut down. Even then I would prefer to tie the aircraft down or chock the wheels. I have seen too many examples of hot brakes cooling down and letting go. Worst I witnessed was a hopelessly inadequate pilot trying to stop his King Air 200 rolling downhill by hanging on to it.
One of the exceptions was the Yak 52 which had an industrial bicycle type hand operated brake on the stick, no foot brakes. If I had to stop for more than a minute or two I would raise the simple metal latch to hold the brakes on. To hold it manually for much longer required hand muscles like Arnie - Schwarz - his - name.
My opinion only, others may differ