By working the rake in the lock you should feel the key pin reach the shear line where the teeth would push them to twist the tension wrench in the correct direction and the lock should spring open.
How to open simple door lock without key.
House door method 1.
However there are reasonably simple tips for opening a locked door without a key.
You have lost your keys.
Push and pull the rake out of the lock twisting it and working by feel.
That is unless you have a master key system in place.
Older locks are typically easier to open without a key while newer ones can be a bit more tricky.
There are some doors on which you can easily find the mounting screws and remove them to disassemble the lock.
The basic pin tumbler lock should work ideally with only one key.
What you will do.
Like i said earlier this sounds much easier than it is in practice.
Use a bump key bump keys are specially crafted keys that are used to unlock pin based locking systems which are used on the vast majority of homes.