Door and Hardware Service Company needs a clean, professional logo

This is what All Locks and Doors was looking for in their logo design

We need a logo for our new business.
The name of the business is "All Locks and Doors". We are locksmiths and door specialists with a CA Contractors license in this field.
Our goal is to provide services to businesses, institutions, contractors and builders. We want commercial work/accounts and are targeting commercial clients.
We prefer very simple, professional designs. Either grey, blue or black; 1 color is normally best. Blue tends to convey security and professionalism. Something that doesn't contain a lot of images (or perhaps any pictures; if so something simple/classy). Maybe just playing with the company name in different fonts/sizes/etc. would be nice?The website is www.alllocksanddoors.com.
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