<human>: Can you give me a shortened version of the text?

So I was our apartment's backyard, putting all of our empty water bottles, soda cans, and other recyclables into 13 gallon trash bags. 

A homeless guy happened to see me putting all the bottles, and asked if he can have some bottles. I offered him one full bag of empty water bottles, which he could go recycle and get a bit of money. So he took it. 

Little did I know, I think he switched our backyard's lock while I wasn't looking. 

Not only is my $250 bike is stolen, now we can't access our backyard from the back gate anymore, but he is freely able to go in and out and steal anything in the backyard. I've noticed more bags have been missing.... 

Now I'm very concerned. He can walk in our backyard, then if he wanted to, smash our sliding window door, granting access to the house, and steal all of our valuables.... 

How can I remove this lock?
<bot>: Gave homeless man a bag  of empty bottles to recycle; he changes our back gate lock, steals my $250 bike, and now has free access in and out of our yard and can possible rob our house.