Laws of uniqueness

peace.
We have a foreign worker at home who takes care of the child in the mornings (a disabled child), and stays after he goes to school to tidy up the house. It turns out that he is left alone with my wife and there is a problem of isolation.
The door to the house can be left unlocked, the thing is that the house is surrounded by a yard, and the yard is locked with a motorized iron gate (it only opens with a code). It's a problem to unlock the gate so they can enter from the outside.
Do you have an idea how to find a solution to the prohibition of exclusive use? (There is no husband's permit in the city because I am usually not in the city).