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force applied to outer edge at right angles to the door

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I do not know where to begin with this particular problem. Does this involve torque since we are moving the door 90 degrees? Here's the problem:

A massive shield door at a neutron test facility at Lawrence Livermore Laboratory is the world's heaviest hinged door. The door has a mass of 44,000 kg, a rotational inertia about its hinge line of 8.7 x 10^4 kg/m^2 and a width of 2.4 m. What steady force, applied at its outer edge at right angles to the door, can move it from rest through an angle of 90 degrees in 30 seconds?

I have NO idea where to even start!

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It finds out the steady force applied to the door at its outer edge at right angles. The solution is detailed and received a '5/5' rating from the student who originally posted the question.

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Force/Inertia
I do not know where to begin with this particular problem. Does this involve torque since we are moving the door 90 degrees? Here's the problem:

A massive shield door at a neutron test facility ...

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