Keeping the door closed helps retain cold conditions while you make a food-storage plan. Opening it repeatedly to feel the contents accelerates warming without giving a reliable safety measurement.
What the observation tells you
The effect of an interruption depends on duration, room conditions and the appliance, so a generic time estimate is not a guarantee. A cold surface felt by hand cannot establish every item's history. Keep track of when the interruption began if possible.
A useful next step
Follow current Food Standards Agency power-cut guidance and use reliable temperature information. Arrange suitable alternatives where required. Do not taste food as a test or repeatedly reconnect an electrically suspect appliance.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.