Hello
Or instead of a pen in your top pocket, have a telescopic airal jobbie with a magnet on the end.
Bought one for a pound and thats one tool that has paid for its self time over again. . .
And was so pleased with this little life saver went out and bought the big brother, same setup but with a mirror on the end.
But a key fob would be easyer I guess . .
regards
TopiToo