Tenant broke the key and now wants me to replace the lock or key

[Nadia Hale]

Hello, so my tenant has bent the key while trying the lock . They say it is unusable at this time . Is it my responsibility as landlord to replace this key if possible ? I don’t even know if it’s possible to do so .

Also, if not possible I am sure she will ask to change the lock 

pleade advise . This is a very difficult tenant who is always unreasonable  with thier requests .

Thanks