My Frigidaire microwave door isn't latching. What can I do to fix this?

When a Frigidaire microwave oven door fails to latch shut or click securely, preventing the appliance from starting, the mechanical failure is typically caused by a buildup of sticky food grease around the latch hooks, a warped plastic door frame, or broken torsion springs in the latch mechanism. To fix this, first unplug the microwave for safety. Second, use warm soapy water and a toothbrush to clean away food debris caked inside the door latch slots and hooks. Third, inspect the plastic latch fingers for cracks. You can troubleshoot door alignment easily. You can verify that your corrective action is successful when cleaning away sticky residue, tightening loose hinge screws, or replacing broken latch springs allows the door to close flush against the chassis and engage the safety interlock switches correctly.