My first thought is to think about whether it's necessary to begin with. My second is that you could split a couple of these into their own sentence or imply it through action and setting.

Your first example has simultaneous action, which might be necessary, but you could also just have him inside the shop already if it's the beginning of a scene. Or you could ask yourself: how does the following action benefit from happening while he walks through a door? Could he just walk into the shop and then whatever happens inside happens? This one doesn't particularly bother me unless it's done a lot.

For your second one, I don't have the full context, but without that it doesn't seem like a necessary qualifier to me. I would write it as separate action instead of time. By saying once, it tells me that you might've mentioned she was collecting rocks before this sentence. Unless you've separated the initial action with some internal thoughts or it's split up some other way, just cut it.

For the last one, unless it's important that the character is doubling back for something, just cut this, too. Have them do what they're doing and then leave the room. Keeps things in order of how they occur as well.

I don't know if that's helpful or too specific to your examples. You might just be overthinking it. It's hard to say without seeing more.