Electromagnetic door locks use a magnetic system to keep a door safely closed. These kinds of door locks are very reliable. They do not use bolts like traditional locks, but will still need to be installed with hardware. Electromagnetic door locks are usually attached to the frame of a door. They are designed to withstand certain amounts of pressure before opening. They work on a lot of different types of door materials like glass, wood, or metal. One important option to consider is whether or not you need your electromagnetic door lock to still work if the power goes out. Some come with a back-up for this need. They are usually designed to hold between 600 to 1,200 pounds of pressure. They install easily and unlock quickly.