<p>Tenants of the Pelham Houses are having trouble going home. They say the front door at 920 Mace Ave. has been broken for two weeks, and their keys won't unlock it. Some tenants are blaming others for damaging the building's shared spaces. As a spot fix, the door has been left propped open, which residents say creates a dangerous situation because trespassers can walk right in. Resident Sylvia Knox says she leaves very early in the morning and that strangers have been in the stairwe...</p>