how does a hummingbird use its bill
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As the hummer extends its tongue, the lamellae capture tiny amounts of nectar. Then when the tongue is withdrawn into the bill, the nectar is mechanically carried into the bird as the lamellae are compressed. Hummingbirds do not live on nectar alone. ... The bill and tongue play a role in foraging for insects.
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As others have pointed out, hummingbirds are perfectly capable of opening their beaks. The reason that the beak appears closed when the hummingbird is feeding is that when the bird extends its tongue the bill is used to squeeze out the nectar it has taken up on its last dip into a flower.
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