Why is my garage door not closing even though there's something in the way?

Your question suggests door not closing even though something is in the way, which is actually correct safety behavior, as garage door safety sensors are designed to prevent closing when obstruction blocks infrared beam to avoid injury. Safety sensors near bottom of tracks send beam, and if something blocks beam, receiving sensor LED blinks and opener refuses to close, blinking light 10 times, which is intended protection. If you meant door not closing even though nothing is in the way, most common cause is sensor misalignment or dirt that makes opener think something blocks beam. Clean sensor lenses, remove leaves, cobwebs, or dirt blocking beam, and align sensors facing each other until LEDs solid. Check for sunlight shining into sensor causing false blockage and shade sensor. If you intentionally have object in way and want door to close, you should not bypass safety sensors permanently, as they prevent injury, but you can hold wall button down continuously, which overrides sensors temporarily and forces door to close while button held, though this should only be done if you are sure path is clear and you watch door. Other reasons door won't close include close travel limit set incorrectly causing reversal, door binding due to rollers off track or broken spring causing force reversal, and manual lock engaged. Ensure nothing physically blocks door travel like ice at floor. Fix sensor alignment promptly for safety.