When you have to

On a coach from Lisbon to Porto
the loo was locked, for safety reasons
the driver had the key.
It takes a modest soul much courage to walk up  
get the key and return it.
I walked the Conesa walk three times.
People began noticing me and appeared friendly.
The driver took pity told me to leave the key in the door
he would pick it up after the journey.
With the key in place, it was surprising
who many who felt the need for a ***.