Electric locks are often used instead of common locking mechanisms in hotels and office buildings. The advantages of these systems lie in their ability to centrally manage access authorization, possibility of reporting arrival and departure times, simple deactivation and reissuing of lost access authorizations when the hardware is lost as well as a reduction of needed hardware with the end user. More and more, such locking mechanisms are also used in residential buildings. Used in this context, there are fundamentally different priorities the user has regarding security and trust in the lock. While an electric locking mechanisms at office buildings places most, if not all of the risk in the employers responsibility, the same setup at home risks the users whole livelihood, or worse, his familiy. This thesis is meant to build a bridge between the topics usability, trust and by extension security. For that, theoretical groundwork is laid at first. A real world example of an electric locking mechanism and the corresponding administration software is presented and put under scrutiny by a usability test. For this, previously described usability testing methods are used. There will also be a survey with the intent of questioning a user-s trust in different locking mechanisms and comparing the corresponding results. This will also be undergone by using usability testing methods. The result of this thesis is an overview over the usability of a locking mechanisms administration software as well as a baseline depicting trust in three different locking mechanisms. There will be mentioned possibilities to measure trust and extend existing models to accommodate this new dimension. In a nutshell, this thesis presents an overview of usability and trust, briefly describes security and presents theoretical models. Then, two studies are done and their results analysed and presented.