Iam in service industry also (auto) if one or two come in yes I will open drawer throw drawer and unload.
Would I ever want to do that the answer is no am I ready yes :22a:
Others have said that while it is quite now it is the time to draw your lines and work out your plans.
Knowing in your self how far and what limits you will tolerate before you act is very very important.
It is said that when you talk to police and DA after the fact that your predefine line will play an important part.
Never being in a shooting and hope to never be, but I have worked on the lines.