What we need is to check that you have the right to enter that home. We always do it, before opening any door, and we explain how to prove it when you call, because it depends on each case.
It is not a lack of trust in you. It is what protects your home on the day the person calling a locksmith is not you. Just as you would not want your door opened for anyone, we do not do that either.
If your papers are inside the house, do not worry: that is very common. Tell us when you get in touch and we will tell you how we sort it out.
We are local people, from here all our lives, and this is how we always work. You can see what a door opening involves in door opening.