Don’t do what a mate did many years ago after doing the Brighton Triathlon… He stoppped by his car to get a towel then went for a swim in the sea after the race to cool off (still wearing his tri gear) but he’d forgotten to zip up the wetsuit pocket where he’d put the car keys…
His phone and wallet were with his towel so he tried phoning home in London, no-one in. In the end his only option was to get the train home (still in tri kit), walk across Blackheath to his house, get the spare house key from under the plant pot, pick up his spare car key from the house then get the train back to pick his car up. The humiliation of having to sit on a train wearing tri gear ensured that he looked after his car keys more carefully next time!