In general, a smart door alarm and locking mechanism and methods for use thereof are provided for maintaining security while providing ease of access to a fuel dispenser. In an exemplary embodiment, the methods and devices are used in fuel dispensing devices for providing fuel to a vehicle. However, the methods and devices can be utilized in any device having a payment system where security and access are both required. In some embodiments, the described methods and systems include a door alarm and door lock kit that allow unlocking one or more doors in a housing of a fuel dispenser and simultaneously disabling or de-activating respective door alarm sensor(s). In a similar manner, the door can be locked and the door alarm sensor activated or re-activated substantially simultaneously.