There are lockers and stuck cabinets all around.
To open those, you should use a tool.
This is the low-spoiler guide for "Opening a locker or a cabinet" puzzle in Don't Escape: 4 Days to Survive. Unlike in normal walkthrough, you get gradual hints on how to solve the puzzle. Click the big button below to see your first hint. If the hint contains a spoiler, you will be warned about it before clicking.