Why do you need two sets of keys?

We ask for two sets of keys in case of emergency or if the walker gets locked out. It also helps us when scheduling last-minute evening or weekend walks. One set of your keys will stay with the walker and one set will stay in our office. We can make a copy of your keys if you do not wish to make an extra set. The copies are $5 per key (some keys are $10 if they are higher security keys). 

How did we do?