Stay calm. For a building lockout, there are a number of things you can do to gain access. First, look around to see if there is another way to get inside. Many times when people panic, they forget to check for a second entrance. If no alternative entrance is accessible, the next thing you should do is call a coworker – there’s usually someone else with a set of keys you can call on. If that fails, a professional locksmith will be able to help you access any commercial space you’ve been locked out of.