Group lockout boxes are the ultimate answer to lockouts involving more than one person. These lock boxes are not only designed to securely hold keys from the lockout procedure, but they can be locked from the outside with multiple padlocks. With this type of lock box, each worker can apply a lock and hold their key - the only way the lockout keys contained inside the box can be removed is if each worker removes their lock.. This works great in busy workplaces or jobs that require multiple workers on the same piece of equipment. Lockout boxes come in different sizes and varieties including portable, heavy-duty and wall mountable.