I am helping my dad with his electronics work and I need help

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curiousperson123
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He is looking for some kind of DC switch that when you say open a door, for two mins it will stay quiet but after two mins have passed, and if the door is still open, the alarm will turn on until the door is closed. It is a way of getting the staff at a shop to close the doors after opening it. I am the one supposed to find this switch online i.e on ebay, because my dad is self employed and he's the only member in his company, but I can't find it whatever I type?
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Dee-Emma
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Google 'fridge door alarm with delay'
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