Every time a technician forgets to take a front door key on a truck roll, your travel time and expense doubles. That tech has to drive back to the office, pick up a key, then drive all the way back out to the site. The same situation can occur if that tech simply picks up the wrong key, as large organizations will have at the very least dozens of similar-looking keys.
With electronic access, your single key or building access code (for keyless entry through keypad locks) allows you to lock and unlock every door lock you need to access, so there's no chance of forgetting the key for a particular door. If you get to a site where you need access and you are not recognized by the system, a network operator can add you or your supervisor to the list instantly.
If an unexpected event comes up and you want to allow access to a site immediately, you can't if you use traditional, physical locks.
If a tech needs extra access to handle an emergency in the field, you can use your web-based electronic key management system to update his or her rights.
If you already have a tech in the field near the site of an alarm, it's almost always best to dispatch them from their current location. If they don't have the right key on hand to open the door, however, they'll have to drive all the way back to the NOC to pick up the key they need.
With remote control of your locking system, the tech can travel straight to the emergency without returning to the office, reducing costly windshield time and accelerating repairs. This is especially important during network failures.