Why does the Yum fails with the error 'Another app is currently holding the yum lock waiting for it to exit' ?

Issue

• The yum command fails with the below error:

[root@rhel7 ~]# yum repolist
Loaded plugins: langpacks, product-id, search-disabled-repos, subscription-manager
Existing lock /var/run/yum.pid: another copy is running as pid 2438.
Another app is currently holding the yum lock; waiting for it to exit...
  The other application is: PackageKit
    Memory :  99 M RSS (560 MB VSZ)
    Started: Mon May  9 07:05:51 2022 - 00:15 ago
    State  : Running, pid: 2438
Another app is currently holding the yum lock; waiting for it to exit...
  The other application is: PackageKit
    Memory : 103 M RSS (568 MB VSZ)
    Started: Mon May  9 07:05:51 2022 - 00:17 ago
    State  : Running, pid: 2438