If the door looks crooked or feels very heavy, leave it down. Do not stand under it. Do not try to help a torsion spring.
If the opener runs and the door barely moves, look at the bottom seal before assuming the opener is dead. Winter meltwater can glaze to Omaha concrete.
Omaha winters freeze meltwater at the bottom seal. Plains wind loads the garage door. Those are common local failure patterns — not a diagnosis of your door.
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