Holes in patio door

We have a sliding patio door. The previous owners, by the looks of things, drilled holes for a second lock at the bottom of the door, then redrilled some more holes and put the lock there.

This means there are some holes where air is coming in from outside and probably the source of the few spiders we have in the room.

What can I plug or seal these with?
Can I just use silicone sealant? Or will that be too gloopy/messy?

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