Hawk locking up

[Lit Hawk]

So I’m stuck at work idk what’s wrong with my bike. When I start it I can hear something rattling inside. It started with my chain becoming really loose when I was leaving work. So I came back really slow and it kept locked no up on me in first even in neutral if I roll it a bit it’ll lock up. Almost like whatever’s rattling around is freezing something up for a bit. Any help is much appreciated.