The door on the windowsill is the kind of iron pin. It was closed well in the morning and opened by myself in the afternoon. Please help me do something.

-Oh, no, just find a strong rope and tie one end to the door handle and the other end to the foot of your bed. If the bed is not heavy enough, try to find something heavy to tie it with. . .

This is only a temporary solution. It is not difficult to go to the hardware store and buy a door pin and install it yourself. It's safer this way, too . .