Is your feature request related to a problem? Please describe.
In my environment, sometimes the execution of snakemake is aborted due to time consuming. In that case, we need to run snakemake --unlock command before re-run snakemake, but it will take time because we have to wait for building the DAG of jobs. My workflow contains a lot of jobs, and building a DAG takes a few minutes.

Describe the solution you'd like
I think snakemake can unlock before building a DAG of jobs. Is it possible?

Describe alternatives you've considered
x

Additional context
It takes too much time just unlocking working directory.

$ time snakemake --unlock
Building DAG of jobs...
Unlocking working directory.

real    2m28.104s
user    0m24.001s
sys     0m8.247s