Daycare lock

So my daughter is starting at daycare next week and when i first looked at the place the front door was locked and u had to be buzzd in to open it, but now its always unlocked. Theres always been a girl upfront at the desk and theres a door thats locked so the kids cant escape, but im feeln weird about it. I'm guessing its just new mom jitters but what do you guys think? Should I be concerned? Does ur kids daycare have a locked door?