If you attempt to close the microwave door while the microwave is still running, a properly functioning microwave oven should have safety mechanisms in place to prevent the door from fully closing. These safety features are designed to interrupt the operation of the microwave when the door is opened or not securely closed.
Typically, when you try to close the microwave door while it's running, you will encounter resistance as the safety interlock system activates. This system consists of latches or switches that are triggered when the door is closed properly, allowing the microwave to operate. If the door is not fully closed or if there is any obstruction preventing it from closing properly, the safety interlock system will prevent the microwave from running.
It's important to note that it is not advisable to try forcing the door to close or tampering with the safety interlock system. These safety mechanisms are in place to protect users from potential harm, such as exposure to microwaves or electrical hazards. If your microwave does not have a functioning safety interlock system or if you encounter any issues with the door, it is recommended to discontinue using the microwave and have it inspected or repaired by a professional technician.