That's what Bigby's Hand does when used in Interposing mode.
There is nothing preventing the incoming character from attempting to get around the hand - teleportation effects will do the job. Sure the hand will automatically move to interpose and still grant cover, but teleportation is not moving through the hand's space and not subject to the Strength issue.
Note that the hand itself is a large object, filling (albeit not completely) a 10×10 foot space. It prevents the target creature from getting any closer than that, but it doesn't stop it from attacking the Hand's caster with a ranged weapon or sufficient reach - it just gives half cover.
Probably the most important bit is that Interposing Hand only works against one target. It doesn't fill the space, so any creature other than the designated target can walk right through it. It's also a Concentration spell, which means hitting the caster hard enough or frequently enough can cause the spell to drop entirely.
Why would one use Grasping Hand instead?
Grasping Hand can grapple the target. A grappled target cannot move. Huge creatures often have reach, so the size of the hand may be insufficient to keep all creatures at bay - plus, those creatures are likely to be the ones with sufficient strength to power through Interposing Hand. Lock a creature down with Grasping Hand, and walk away.
And hey, you can crush them, too.
Why would one use Clenched Fist instead?
Clenched Fist and Grasping Hand both do damage, right? Sure... but Grasping Hand deals bludgeoning damage (a frequently resisted damage type) and Clenched Fist deals force damage (a rarely resisted damage type).
Why would one use Forceful Hand instead?
For the laughs, of course. Doesn't the idea of shoving people off of things with a ten foot hand make you chuckle?
Bigby's Hand is a highly flexible spell. You have to pick the right mode for the right opponent.