Cancellation of abnormal operation of fire shutter

While waiting at a certain home center, the fire shutter suddenly started to close. All four have begun to close.Employees arrived a few minutes later, but it seems that the switch box cannot be opened.

fire shutter

Hold the keybox, neither that nor this, only time passes.Cars entering and leaving the garage began to be congested, and I couldn't leave my warehousing.

I called out and turned the cylinder of the box to unlock it, and operated the shutter return button and the shutter up button to open and release one shutter.

fire shutter

The remaining three machines seemed to find the key soon, but they didn't come into play, but they seemed to be lever-type, manually operated heavy-duty shutters instead of electric ones.